Commit | Line | Data |
---|---|---|
643f12db | 1 | ThinkPad ACPI Extras Driver |
1da177e4 | 2 | |
643f12db | 3 | Version 0.14 |
54ae1501 | 4 | April 21st, 2007 |
1da177e4 LT |
5 | |
6 | Borislav Deianov <borislav@users.sf.net> | |
38f996ed | 7 | Henrique de Moraes Holschuh <hmh@hmh.eng.br> |
1da177e4 LT |
8 | http://ibm-acpi.sf.net/ |
9 | ||
10 | ||
643f12db HMH |
11 | This is a Linux driver for the IBM and Lenovo ThinkPad laptops. It |
12 | supports various features of these laptops which are accessible | |
13 | through the ACPI and ACPI EC framework, but not otherwise fully | |
14 | supported by the generic Linux ACPI drivers. | |
15 | ||
16 | This driver used to be named ibm-acpi until kernel 2.6.21 and release | |
17 | 0.13-20070314. It used to be in the drivers/acpi tree, but it was | |
18 | moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel | |
19 | 2.6.22, and release 0.14. | |
1da177e4 LT |
20 | |
21 | ||
22 | Status | |
23 | ------ | |
24 | ||
25 | The features currently supported are the following (see below for | |
26 | detailed description): | |
27 | ||
28 | - Fn key combinations | |
29 | - Bluetooth enable and disable | |
837ca6dd | 30 | - video output switching, expansion control |
1da177e4 LT |
31 | - ThinkLight on and off |
32 | - limited docking and undocking | |
33 | - UltraBay eject | |
78f81cc4 BD |
34 | - CMOS control |
35 | - LED control | |
36 | - ACPI sounds | |
37 | - temperature sensors | |
38 | - Experimental: embedded controller register dump | |
24f7ff0a SS |
39 | - LCD brightness control |
40 | - Volume control | |
ecf2a80a | 41 | - Fan control and monitoring: fan speed, fan enable/disable |
28b779d1 | 42 | - Experimental: WAN enable and disable |
1da177e4 LT |
43 | |
44 | A compatibility table by model and feature is maintained on the web | |
45 | site, http://ibm-acpi.sf.net/. I appreciate any success or failure | |
46 | reports, especially if they add to or correct the compatibility table. | |
47 | Please include the following information in your report: | |
48 | ||
49 | - ThinkPad model name | |
50 | - a copy of your DSDT, from /proc/acpi/dsdt | |
643f12db HMH |
51 | - a copy of the output of dmidecode, with serial numbers |
52 | and UUIDs masked off | |
1da177e4 LT |
53 | - which driver features work and which don't |
54 | - the observed behavior of non-working features | |
55 | ||
56 | Any other comments or patches are also more than welcome. | |
57 | ||
58 | ||
59 | Installation | |
60 | ------------ | |
61 | ||
62 | If you are compiling this driver as included in the Linux kernel | |
643f12db HMH |
63 | sources, simply enable the CONFIG_THINKPAD_ACPI option, and optionally |
64 | enable the CONFIG_THINKPAD_ACPI_BAY option if you want the | |
65 | thinkpad-specific bay functionality. | |
1da177e4 LT |
66 | |
67 | Features | |
68 | -------- | |
69 | ||
54ae1501 HMH |
70 | The driver exports two different interfaces to userspace, which can be |
71 | used to access the features it provides. One is a legacy procfs-based | |
72 | interface, which will be removed at some time in the distant future. | |
73 | The other is a new sysfs-based interface which is not complete yet. | |
74 | ||
75 | The procfs interface creates the /proc/acpi/ibm directory. There is a | |
76 | file under that directory for each feature it supports. The procfs | |
77 | interface is mostly frozen, and will change very little if at all: it | |
78 | will not be extended to add any new functionality in the driver, instead | |
79 | all new functionality will be implemented on the sysfs interface. | |
80 | ||
81 | The sysfs interface tries to blend in the generic Linux sysfs subsystems | |
82 | and classes as much as possible. Since some of these subsystems are not | |
83 | yet ready or stabilized, it is expected that this interface will change, | |
84 | and any and all userspace programs must deal with it. | |
85 | ||
86 | ||
87 | Notes about the sysfs interface: | |
88 | ||
89 | Unlike what was done with the procfs interface, correctness when talking | |
90 | to the sysfs interfaces will be enforced, as will correctness in the | |
91 | thinkpad-acpi's implementation of sysfs interfaces. | |
92 | ||
93 | Also, any bugs in the thinkpad-acpi sysfs driver code or in the | |
94 | thinkpad-acpi's implementation of the sysfs interfaces will be fixed for | |
95 | maximum correctness, even if that means changing an interface in | |
96 | non-compatible ways. As these interfaces mature both in the kernel and | |
97 | in thinkpad-acpi, such changes should become quite rare. | |
98 | ||
99 | Applications interfacing to the thinkpad-acpi sysfs interfaces must | |
100 | follow all sysfs guidelines and correctly process all errors (the sysfs | |
101 | interface makes extensive use of errors). File descriptors and open / | |
102 | close operations to the sysfs inodes must also be properly implemented. | |
1da177e4 | 103 | |
176750d6 HMH |
104 | The version of thinkpad-acpi's sysfs interface is exported by the driver |
105 | as a driver attribute (see below). | |
106 | ||
107 | Sysfs driver attributes are on the driver's sysfs attribute space, | |
108 | for 2.6.20 this is /sys/bus/platform/drivers/thinkpad-acpi/. | |
109 | ||
110 | Sysfs device attributes are on the driver's sysfs attribute space, | |
111 | for 2.6.20 this is /sys/devices/platform/thinkpad-acpi/. | |
112 | ||
113 | Driver version | |
114 | -------------- | |
115 | ||
116 | procfs: /proc/acpi/ibm/driver | |
117 | sysfs driver attribute: version | |
1da177e4 LT |
118 | |
119 | The driver name and version. No commands can be written to this file. | |
120 | ||
176750d6 HMH |
121 | Sysfs interface version |
122 | ----------------------- | |
123 | ||
124 | sysfs driver attribute: interface_version | |
125 | ||
126 | Version of the thinkpad-acpi sysfs interface, as an unsigned long | |
127 | (output in hex format: 0xAAAABBCC), where: | |
128 | AAAA - major revision | |
129 | BB - minor revision | |
130 | CC - bugfix revision | |
131 | ||
132 | The sysfs interface version changelog for the driver can be found at the | |
133 | end of this document. Changes to the sysfs interface done by the kernel | |
134 | subsystems are not documented here, nor are they tracked by this | |
135 | attribute. | |
136 | ||
a0416420 HMH |
137 | Hot keys |
138 | -------- | |
139 | ||
140 | procfs: /proc/acpi/ibm/hotkey | |
cc4c24e1 | 141 | sysfs device attribute: hotkey_* |
1da177e4 LT |
142 | |
143 | Without this driver, only the Fn-F4 key (sleep button) generates an | |
144 | ACPI event. With the driver loaded, the hotkey feature enabled and the | |
145 | mask set (see below), the various hot keys generate ACPI events in the | |
146 | following format: | |
147 | ||
148 | ibm/hotkey HKEY 00000080 0000xxxx | |
149 | ||
150 | The last four digits vary depending on the key combination pressed. | |
151 | All labeled Fn-Fx key combinations generate distinct events. In | |
152 | addition, the lid microswitch and some docking station buttons may | |
153 | also generate such events. | |
154 | ||
1da177e4 LT |
155 | The bit mask allows some control over which hot keys generate ACPI |
156 | events. Not all bits in the mask can be modified. Not all bits that | |
157 | can be modified do anything. Not all hot keys can be individually | |
158 | controlled by the mask. Most recent ThinkPad models honor the | |
159 | following bits (assuming the hot keys feature has been enabled): | |
160 | ||
161 | key bit behavior when set behavior when unset | |
162 | ||
163 | Fn-F3 always generates ACPI event | |
164 | Fn-F4 always generates ACPI event | |
165 | Fn-F5 0010 generate ACPI event enable/disable Bluetooth | |
166 | Fn-F7 0040 generate ACPI event switch LCD and external display | |
167 | Fn-F8 0080 generate ACPI event expand screen or none | |
168 | Fn-F9 0100 generate ACPI event none | |
169 | Fn-F12 always generates ACPI event | |
170 | ||
171 | Some models do not support all of the above. For example, the T30 does | |
172 | not support Fn-F5 and Fn-F9. Other models do not support the mask at | |
173 | all. On those models, hot keys cannot be controlled individually. | |
174 | ||
175 | Note that enabling ACPI events for some keys prevents their default | |
176 | behavior. For example, if events for Fn-F5 are enabled, that key will | |
177 | no longer enable/disable Bluetooth by itself. This can still be done | |
178 | from an acpid handler for the ibm/hotkey event. | |
179 | ||
180 | Note also that not all Fn key combinations are supported through | |
181 | ACPI. For example, on the X40, the brightness, volume and "Access IBM" | |
182 | buttons do not generate ACPI events even with this driver. They *can* | |
183 | be used through the "ThinkPad Buttons" utility, see | |
184 | http://www.nongnu.org/tpb/ | |
185 | ||
a0416420 HMH |
186 | procfs notes: |
187 | ||
188 | The following commands can be written to the /proc/acpi/ibm/hotkey file: | |
189 | ||
190 | echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature | |
191 | echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature | |
192 | echo 0xffff > /proc/acpi/ibm/hotkey -- enable all possible hot keys | |
193 | echo 0x0000 > /proc/acpi/ibm/hotkey -- disable all possible hot keys | |
194 | ... any other 4-hex-digit mask ... | |
195 | echo reset > /proc/acpi/ibm/hotkey -- restore the original mask | |
196 | ||
197 | sysfs notes: | |
198 | ||
cc4c24e1 | 199 | hotkey_bios_enabled: |
a0416420 HMH |
200 | Returns the status of the hot keys feature when |
201 | thinkpad-acpi was loaded. Upon module unload, the hot | |
202 | key feature status will be restored to this value. | |
203 | ||
204 | 0: hot keys were disabled | |
205 | 1: hot keys were enabled | |
206 | ||
cc4c24e1 | 207 | hotkey_bios_mask: |
a0416420 HMH |
208 | Returns the hot keys mask when thinkpad-acpi was loaded. |
209 | Upon module unload, the hot keys mask will be restored | |
210 | to this value. | |
211 | ||
cc4c24e1 | 212 | hotkey_enable: |
a0416420 HMH |
213 | Enables/disables the hot keys feature, and reports |
214 | current status of the hot keys feature. | |
215 | ||
216 | 0: disables the hot keys feature / feature disabled | |
217 | 1: enables the hot keys feature / feature enabled | |
218 | ||
cc4c24e1 | 219 | hotkey_mask: |
a0416420 HMH |
220 | bit mask to enable ACPI event generation for each hot |
221 | key (see above). Returns the current status of the hot | |
222 | keys mask, and allows one to modify it. | |
223 | ||
224 | ||
d3a6ade4 HMH |
225 | Bluetooth |
226 | --------- | |
1da177e4 | 227 | |
d3a6ade4 | 228 | procfs: /proc/acpi/ibm/bluetooth |
cc4c24e1 | 229 | sysfs device attribute: bluetooth_enable |
d3a6ade4 HMH |
230 | |
231 | This feature shows the presence and current state of a ThinkPad | |
232 | Bluetooth device in the internal ThinkPad CDC slot. | |
233 | ||
234 | Procfs notes: | |
235 | ||
236 | If Bluetooth is installed, the following commands can be used: | |
1da177e4 LT |
237 | |
238 | echo enable > /proc/acpi/ibm/bluetooth | |
239 | echo disable > /proc/acpi/ibm/bluetooth | |
240 | ||
d3a6ade4 HMH |
241 | Sysfs notes: |
242 | ||
243 | If the Bluetooth CDC card is installed, it can be enabled / | |
cc4c24e1 | 244 | disabled through the "bluetooth_enable" thinkpad-acpi device |
d3a6ade4 HMH |
245 | attribute, and its current status can also be queried. |
246 | ||
247 | enable: | |
248 | 0: disables Bluetooth / Bluetooth is disabled | |
249 | 1: enables Bluetooth / Bluetooth is enabled. | |
250 | ||
251 | Note: this interface will be probably be superseeded by the | |
cc4c24e1 | 252 | generic rfkill class, so it is NOT to be considered stable yet. |
d3a6ade4 | 253 | |
1da177e4 LT |
254 | Video output control -- /proc/acpi/ibm/video |
255 | -------------------------------------------- | |
256 | ||
257 | This feature allows control over the devices used for video output - | |
258 | LCD, CRT or DVI (if available). The following commands are available: | |
259 | ||
260 | echo lcd_enable > /proc/acpi/ibm/video | |
261 | echo lcd_disable > /proc/acpi/ibm/video | |
262 | echo crt_enable > /proc/acpi/ibm/video | |
263 | echo crt_disable > /proc/acpi/ibm/video | |
264 | echo dvi_enable > /proc/acpi/ibm/video | |
265 | echo dvi_disable > /proc/acpi/ibm/video | |
266 | echo auto_enable > /proc/acpi/ibm/video | |
267 | echo auto_disable > /proc/acpi/ibm/video | |
268 | echo expand_toggle > /proc/acpi/ibm/video | |
269 | echo video_switch > /proc/acpi/ibm/video | |
270 | ||
271 | Each video output device can be enabled or disabled individually. | |
272 | Reading /proc/acpi/ibm/video shows the status of each device. | |
273 | ||
274 | Automatic video switching can be enabled or disabled. When automatic | |
275 | video switching is enabled, certain events (e.g. opening the lid, | |
276 | docking or undocking) cause the video output device to change | |
277 | automatically. While this can be useful, it also causes flickering | |
278 | and, on the X40, video corruption. By disabling automatic switching, | |
279 | the flickering or video corruption can be avoided. | |
280 | ||
281 | The video_switch command cycles through the available video outputs | |
78f81cc4 | 282 | (it simulates the behavior of Fn-F7). |
1da177e4 LT |
283 | |
284 | Video expansion can be toggled through this feature. This controls | |
285 | whether the display is expanded to fill the entire LCD screen when a | |
286 | mode with less than full resolution is used. Note that the current | |
287 | video expansion status cannot be determined through this feature. | |
288 | ||
289 | Note that on many models (particularly those using Radeon graphics | |
290 | chips) the X driver configures the video card in a way which prevents | |
291 | Fn-F7 from working. This also disables the video output switching | |
292 | features of this driver, as it uses the same ACPI methods as | |
293 | Fn-F7. Video switching on the console should still work. | |
294 | ||
78f81cc4 BD |
295 | UPDATE: There's now a patch for the X.org Radeon driver which |
296 | addresses this issue. Some people are reporting success with the patch | |
297 | while others are still having problems. For more information: | |
298 | ||
299 | https://bugs.freedesktop.org/show_bug.cgi?id=2000 | |
300 | ||
1da177e4 LT |
301 | ThinkLight control -- /proc/acpi/ibm/light |
302 | ------------------------------------------ | |
303 | ||
304 | The current status of the ThinkLight can be found in this file. A few | |
305 | models which do not make the status available will show it as | |
306 | "unknown". The available commands are: | |
307 | ||
308 | echo on > /proc/acpi/ibm/light | |
309 | echo off > /proc/acpi/ibm/light | |
310 | ||
78f81cc4 | 311 | Docking / undocking -- /proc/acpi/ibm/dock |
1da177e4 LT |
312 | ------------------------------------------ |
313 | ||
314 | Docking and undocking (e.g. with the X4 UltraBase) requires some | |
315 | actions to be taken by the operating system to safely make or break | |
316 | the electrical connections with the dock. | |
317 | ||
318 | The docking feature of this driver generates the following ACPI events: | |
319 | ||
320 | ibm/dock GDCK 00000003 00000001 -- eject request | |
321 | ibm/dock GDCK 00000003 00000002 -- undocked | |
322 | ibm/dock GDCK 00000000 00000003 -- docked | |
323 | ||
324 | NOTE: These events will only be generated if the laptop was docked | |
325 | when originally booted. This is due to the current lack of support for | |
326 | hot plugging of devices in the Linux ACPI framework. If the laptop was | |
327 | booted while not in the dock, the following message is shown in the | |
78f81cc4 BD |
328 | logs: |
329 | ||
643f12db | 330 | Mar 17 01:42:34 aero kernel: thinkpad_acpi: dock device not present |
78f81cc4 BD |
331 | |
332 | In this case, no dock-related events are generated but the dock and | |
333 | undock commands described below still work. They can be executed | |
334 | manually or triggered by Fn key combinations (see the example acpid | |
335 | configuration files included in the driver tarball package available | |
336 | on the web site). | |
1da177e4 LT |
337 | |
338 | When the eject request button on the dock is pressed, the first event | |
339 | above is generated. The handler for this event should issue the | |
340 | following command: | |
341 | ||
342 | echo undock > /proc/acpi/ibm/dock | |
343 | ||
344 | After the LED on the dock goes off, it is safe to eject the laptop. | |
345 | Note: if you pressed this key by mistake, go ahead and eject the | |
346 | laptop, then dock it back in. Otherwise, the dock may not function as | |
347 | expected. | |
348 | ||
349 | When the laptop is docked, the third event above is generated. The | |
350 | handler for this event should issue the following command to fully | |
351 | enable the dock: | |
352 | ||
353 | echo dock > /proc/acpi/ibm/dock | |
354 | ||
355 | The contents of the /proc/acpi/ibm/dock file shows the current status | |
356 | of the dock, as provided by the ACPI framework. | |
357 | ||
358 | The docking support in this driver does not take care of enabling or | |
359 | disabling any other devices you may have attached to the dock. For | |
360 | example, a CD drive plugged into the UltraBase needs to be disabled or | |
361 | enabled separately. See the provided example acpid configuration files | |
362 | for how this can be accomplished. | |
363 | ||
364 | There is no support yet for PCI devices that may be attached to a | |
365 | docking station, e.g. in the ThinkPad Dock II. The driver currently | |
366 | does not recognize, enable or disable such devices. This means that | |
367 | the only docking stations currently supported are the X-series | |
368 | UltraBase docks and "dumb" port replicators like the Mini Dock (the | |
369 | latter don't need any ACPI support, actually). | |
370 | ||
78f81cc4 | 371 | UltraBay eject -- /proc/acpi/ibm/bay |
1da177e4 LT |
372 | ------------------------------------ |
373 | ||
374 | Inserting or ejecting an UltraBay device requires some actions to be | |
375 | taken by the operating system to safely make or break the electrical | |
376 | connections with the device. | |
377 | ||
378 | This feature generates the following ACPI events: | |
379 | ||
380 | ibm/bay MSTR 00000003 00000000 -- eject request | |
381 | ibm/bay MSTR 00000001 00000000 -- eject lever inserted | |
382 | ||
383 | NOTE: These events will only be generated if the UltraBay was present | |
384 | when the laptop was originally booted (on the X series, the UltraBay | |
385 | is in the dock, so it may not be present if the laptop was undocked). | |
386 | This is due to the current lack of support for hot plugging of devices | |
387 | in the Linux ACPI framework. If the laptop was booted without the | |
78f81cc4 BD |
388 | UltraBay, the following message is shown in the logs: |
389 | ||
643f12db | 390 | Mar 17 01:42:34 aero kernel: thinkpad_acpi: bay device not present |
78f81cc4 BD |
391 | |
392 | In this case, no bay-related events are generated but the eject | |
1da177e4 LT |
393 | command described below still works. It can be executed manually or |
394 | triggered by a hot key combination. | |
395 | ||
396 | Sliding the eject lever generates the first event shown above. The | |
397 | handler for this event should take whatever actions are necessary to | |
398 | shut down the device in the UltraBay (e.g. call idectl), then issue | |
399 | the following command: | |
400 | ||
401 | echo eject > /proc/acpi/ibm/bay | |
402 | ||
403 | After the LED on the UltraBay goes off, it is safe to pull out the | |
404 | device. | |
405 | ||
406 | When the eject lever is inserted, the second event above is | |
407 | generated. The handler for this event should take whatever actions are | |
408 | necessary to enable the UltraBay device (e.g. call idectl). | |
409 | ||
410 | The contents of the /proc/acpi/ibm/bay file shows the current status | |
411 | of the UltraBay, as provided by the ACPI framework. | |
412 | ||
78f81cc4 BD |
413 | EXPERIMENTAL warm eject support on the 600e/x, A22p and A3x (To use |
414 | this feature, you need to supply the experimental=1 parameter when | |
415 | loading the module): | |
416 | ||
417 | These models do not have a button near the UltraBay device to request | |
418 | a hot eject but rather require the laptop to be put to sleep | |
419 | (suspend-to-ram) before the bay device is ejected or inserted). | |
420 | The sequence of steps to eject the device is as follows: | |
421 | ||
422 | echo eject > /proc/acpi/ibm/bay | |
423 | put the ThinkPad to sleep | |
424 | remove the drive | |
425 | resume from sleep | |
426 | cat /proc/acpi/ibm/bay should show that the drive was removed | |
427 | ||
428 | On the A3x, both the UltraBay 2000 and UltraBay Plus devices are | |
429 | supported. Use "eject2" instead of "eject" for the second bay. | |
1da177e4 | 430 | |
78f81cc4 BD |
431 | Note: the UltraBay eject support on the 600e/x, A22p and A3x is |
432 | EXPERIMENTAL and may not work as expected. USE WITH CAUTION! | |
1da177e4 | 433 | |
b616004c HMH |
434 | CMOS control |
435 | ------------ | |
436 | ||
437 | procfs: /proc/acpi/ibm/cmos | |
438 | sysfs device attribute: cmos_command | |
1da177e4 LT |
439 | |
440 | This feature is used internally by the ACPI firmware to control the | |
78f81cc4 BD |
441 | ThinkLight on most newer ThinkPad models. It may also control LCD |
442 | brightness, sounds volume and more, but only on some models. | |
1da177e4 | 443 | |
b616004c HMH |
444 | The range of valid cmos command numbers is 0 to 21, but not all have an |
445 | effect and the behavior varies from model to model. Here is the behavior | |
446 | on the X40 (tpb is the ThinkPad Buttons utility): | |
1da177e4 LT |
447 | |
448 | 0 - no effect but tpb reports "Volume down" | |
449 | 1 - no effect but tpb reports "Volume up" | |
450 | 2 - no effect but tpb reports "Mute on" | |
451 | 3 - simulate pressing the "Access IBM" button | |
452 | 4 - LCD brightness up | |
453 | 5 - LCD brightness down | |
454 | 11 - toggle screen expansion | |
455 | 12 - ThinkLight on | |
456 | 13 - ThinkLight off | |
457 | 14 - no effect but tpb reports ThinkLight status change | |
458 | ||
b616004c HMH |
459 | The cmos command interface is prone to firmware split-brain problems, as |
460 | in newer ThinkPads it is just a compatibility layer. | |
461 | ||
78f81cc4 BD |
462 | LED control -- /proc/acpi/ibm/led |
463 | --------------------------------- | |
1da177e4 LT |
464 | |
465 | Some of the LED indicators can be controlled through this feature. The | |
466 | available commands are: | |
467 | ||
78f81cc4 BD |
468 | echo '<led number> on' >/proc/acpi/ibm/led |
469 | echo '<led number> off' >/proc/acpi/ibm/led | |
470 | echo '<led number> blink' >/proc/acpi/ibm/led | |
1da177e4 | 471 | |
78f81cc4 BD |
472 | The <led number> range is 0 to 7. The set of LEDs that can be |
473 | controlled varies from model to model. Here is the mapping on the X40: | |
1da177e4 LT |
474 | |
475 | 0 - power | |
476 | 1 - battery (orange) | |
477 | 2 - battery (green) | |
478 | 3 - UltraBase | |
479 | 4 - UltraBay | |
480 | 7 - standby | |
481 | ||
482 | All of the above can be turned on and off and can be made to blink. | |
483 | ||
78f81cc4 BD |
484 | ACPI sounds -- /proc/acpi/ibm/beep |
485 | ---------------------------------- | |
1da177e4 LT |
486 | |
487 | The BEEP method is used internally by the ACPI firmware to provide | |
78f81cc4 | 488 | audible alerts in various situations. This feature allows the same |
1da177e4 LT |
489 | sounds to be triggered manually. |
490 | ||
491 | The commands are non-negative integer numbers: | |
492 | ||
78f81cc4 | 493 | echo <number> >/proc/acpi/ibm/beep |
1da177e4 | 494 | |
78f81cc4 BD |
495 | The valid <number> range is 0 to 17. Not all numbers trigger sounds |
496 | and the sounds vary from model to model. Here is the behavior on the | |
497 | X40: | |
1da177e4 | 498 | |
78f81cc4 BD |
499 | 0 - stop a sound in progress (but use 17 to stop 16) |
500 | 2 - two beeps, pause, third beep ("low battery") | |
1da177e4 | 501 | 3 - single beep |
78f81cc4 | 502 | 4 - high, followed by low-pitched beep ("unable") |
1da177e4 | 503 | 5 - single beep |
78f81cc4 | 504 | 6 - very high, followed by high-pitched beep ("AC/DC") |
1da177e4 LT |
505 | 7 - high-pitched beep |
506 | 9 - three short beeps | |
507 | 10 - very long beep | |
508 | 12 - low-pitched beep | |
78f81cc4 BD |
509 | 15 - three high-pitched beeps repeating constantly, stop with 0 |
510 | 16 - one medium-pitched beep repeating constantly, stop with 17 | |
511 | 17 - stop 16 | |
512 | ||
2c37aa4e HMH |
513 | Temperature sensors |
514 | ------------------- | |
515 | ||
516 | procfs: /proc/acpi/ibm/thermal | |
517 | sysfs device attributes: (hwmon) temp*_input | |
78f81cc4 BD |
518 | |
519 | Most ThinkPads include six or more separate temperature sensors but | |
520 | only expose the CPU temperature through the standard ACPI methods. | |
60eb0b35 HMH |
521 | This feature shows readings from up to eight different sensors on older |
522 | ThinkPads, and it has experimental support for up to sixteen different | |
2c37aa4e | 523 | sensors on newer ThinkPads. |
60eb0b35 HMH |
524 | |
525 | EXPERIMENTAL: The 16-sensors feature is marked EXPERIMENTAL because the | |
526 | implementation directly accesses hardware registers and may not work as | |
527 | expected. USE WITH CAUTION! To use this feature, you need to supply the | |
528 | experimental=1 parameter when loading the module. When EXPERIMENTAL | |
529 | mode is enabled, reading the first 8 sensors on newer ThinkPads will | |
530 | also use an new experimental thermal sensor access mode. | |
531 | ||
532 | For example, on the X40, a typical output may be: | |
78f81cc4 BD |
533 | temperatures: 42 42 45 41 36 -128 33 -128 |
534 | ||
60eb0b35 HMH |
535 | EXPERIMENTAL: On the T43/p, a typical output may be: |
536 | temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128 | |
537 | ||
538 | The mapping of thermal sensors to physical locations varies depending on | |
539 | system-board model (and thus, on ThinkPad model). | |
540 | ||
541 | http://thinkwiki.org/wiki/Thermal_Sensors is a public wiki page that | |
542 | tries to track down these locations for various models. | |
543 | ||
544 | Most (newer?) models seem to follow this pattern: | |
78f81cc4 BD |
545 | |
546 | 1: CPU | |
60eb0b35 HMH |
547 | 2: (depends on model) |
548 | 3: (depends on model) | |
78f81cc4 | 549 | 4: GPU |
60eb0b35 HMH |
550 | 5: Main battery: main sensor |
551 | 6: Bay battery: main sensor | |
552 | 7: Main battery: secondary sensor | |
553 | 8: Bay battery: secondary sensor | |
554 | 9-15: (depends on model) | |
555 | ||
556 | For the R51 (source: Thomas Gruber): | |
557 | 2: Mini-PCI | |
558 | 3: Internal HDD | |
559 | ||
560 | For the T43, T43/p (source: Shmidoax/Thinkwiki.org) | |
561 | http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_T43.2C_T43p | |
562 | 2: System board, left side (near PCMCIA slot), reported as HDAPS temp | |
563 | 3: PCMCIA slot | |
564 | 9: MCH (northbridge) to DRAM Bus | |
565 | 10: ICH (southbridge), under Mini-PCI card, under touchpad | |
566 | 11: Power regulator, underside of system board, below F2 key | |
78f81cc4 | 567 | |
88679a15 HMH |
568 | The A31 has a very atypical layout for the thermal sensors |
569 | (source: Milos Popovic, http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_A31) | |
570 | 1: CPU | |
571 | 2: Main Battery: main sensor | |
572 | 3: Power Converter | |
573 | 4: Bay Battery: main sensor | |
574 | 5: MCH (northbridge) | |
575 | 6: PCMCIA/ambient | |
576 | 7: Main Battery: secondary sensor | |
577 | 8: Bay Battery: secondary sensor | |
578 | ||
78f81cc4 | 579 | |
2c37aa4e HMH |
580 | Procfs notes: |
581 | Readings from sensors that are not available return -128. | |
582 | No commands can be written to this file. | |
583 | ||
584 | Sysfs notes: | |
585 | Sensors that are not available return the ENXIO error. This | |
586 | status may change at runtime, as there are hotplug thermal | |
587 | sensors, like those inside the batteries and docks. | |
588 | ||
589 | thinkpad-acpi thermal sensors are reported through the hwmon | |
590 | subsystem, and follow all of the hwmon guidelines at | |
591 | Documentation/hwmon. | |
592 | ||
593 | ||
d6bc8ac9 | 594 | EXPERIMENTAL: Embedded controller register dump -- /proc/acpi/ibm/ecdump |
78f81cc4 BD |
595 | ------------------------------------------------------------------------ |
596 | ||
597 | This feature is marked EXPERIMENTAL because the implementation | |
598 | directly accesses hardware registers and may not work as expected. USE | |
599 | WITH CAUTION! To use this feature, you need to supply the | |
600 | experimental=1 parameter when loading the module. | |
601 | ||
602 | This feature dumps the values of 256 embedded controller | |
603 | registers. Values which have changed since the last time the registers | |
604 | were dumped are marked with a star: | |
605 | ||
837ca6dd | 606 | [root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump |
78f81cc4 BD |
607 | EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f |
608 | EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00 | |
609 | EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00 | |
610 | EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80 | |
611 | EC 0x30: 01 07 1a 00 30 04 00 00 *85 00 00 10 00 50 00 00 | |
612 | EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00 | |
613 | EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 *bc *02 *bc | |
614 | EC 0x60: *02 *bc *02 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
615 | EC 0x70: 00 00 00 00 00 12 30 40 *24 *26 *2c *27 *20 80 *1f 80 | |
616 | EC 0x80: 00 00 00 06 *37 *0e 03 00 00 00 0e 07 00 00 00 00 | |
617 | EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
618 | EC 0xa0: *ff 09 ff 09 ff ff *64 00 *00 *00 *a2 41 *ff *ff *e0 00 | |
619 | EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
620 | EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
621 | EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
622 | EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03 | |
623 | EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a | |
624 | ||
625 | This feature can be used to determine the register holding the fan | |
626 | speed on some models. To do that, do the following: | |
627 | ||
628 | - make sure the battery is fully charged | |
629 | - make sure the fan is running | |
630 | - run 'cat /proc/acpi/ibm/ecdump' several times, once per second or so | |
631 | ||
632 | The first step makes sure various charging-related values don't | |
633 | vary. The second ensures that the fan-related values do vary, since | |
634 | the fan speed fluctuates a bit. The third will (hopefully) mark the | |
635 | fan register with a star: | |
636 | ||
837ca6dd | 637 | [root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump |
78f81cc4 BD |
638 | EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f |
639 | EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00 | |
640 | EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00 | |
641 | EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80 | |
642 | EC 0x30: 01 07 1a 00 30 04 00 00 85 00 00 10 00 50 00 00 | |
643 | EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00 | |
644 | EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 bc 02 bc | |
645 | EC 0x60: 02 bc 02 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
646 | EC 0x70: 00 00 00 00 00 12 30 40 24 27 2c 27 21 80 1f 80 | |
647 | EC 0x80: 00 00 00 06 *be 0d 03 00 00 00 0e 07 00 00 00 00 | |
648 | EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
649 | EC 0xa0: ff 09 ff 09 ff ff 64 00 00 00 a2 41 ff ff e0 00 | |
650 | EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
651 | EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
652 | EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | |
653 | EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03 | |
654 | EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a | |
655 | ||
656 | Another set of values that varies often is the temperature | |
657 | readings. Since temperatures don't change vary fast, you can take | |
658 | several quick dumps to eliminate them. | |
659 | ||
660 | You can use a similar method to figure out the meaning of other | |
661 | embedded controller registers - e.g. make sure nothing else changes | |
662 | except the charging or discharging battery to determine which | |
663 | registers contain the current battery capacity, etc. If you experiment | |
664 | with this, do send me your results (including some complete dumps with | |
665 | a description of the conditions when they were taken.) | |
666 | ||
7d5a015e HMH |
667 | LCD brightness control |
668 | ---------------------- | |
669 | ||
670 | procfs: /proc/acpi/ibm/brightness | |
671 | sysfs backlight device "thinkpad_screen" | |
78f81cc4 BD |
672 | |
673 | This feature allows software control of the LCD brightness on ThinkPad | |
7d5a015e HMH |
674 | models which don't have a hardware brightness slider. |
675 | ||
676 | It has some limitations: the LCD backlight cannot be actually turned on or off | |
677 | by this interface, and in many ThinkPad models, the "dim while on battery" | |
678 | functionality will be enabled by the BIOS when this interface is used, and | |
679 | cannot be controlled. | |
680 | ||
681 | The backlight control has eight levels, ranging from 0 to 7. Some of the | |
682 | levels may not be distinct. | |
683 | ||
684 | Procfs notes: | |
685 | ||
686 | The available commands are: | |
78f81cc4 BD |
687 | |
688 | echo up >/proc/acpi/ibm/brightness | |
689 | echo down >/proc/acpi/ibm/brightness | |
690 | echo 'level <level>' >/proc/acpi/ibm/brightness | |
691 | ||
7d5a015e HMH |
692 | Sysfs notes: |
693 | ||
694 | The interface is implemented through the backlight sysfs class, which is poorly | |
695 | documented at this time. | |
696 | ||
697 | Locate the thinkpad_screen device under /sys/class/backlight, and inside it | |
698 | there will be the following attributes: | |
699 | ||
700 | max_brightness: | |
701 | Reads the maximum brightness the hardware can be set to. | |
702 | The minimum is always zero. | |
703 | ||
704 | actual_brightness: | |
705 | Reads what brightness the screen is set to at this instant. | |
706 | ||
707 | brightness: | |
708 | Writes request the driver to change brightness to the given | |
709 | value. Reads will tell you what brightness the driver is trying | |
710 | to set the display to when "power" is set to zero and the display | |
711 | has not been dimmed by a kernel power management event. | |
712 | ||
713 | power: | |
714 | power management mode, where 0 is "display on", and 1 to 3 will | |
715 | dim the display backlight to brightness level 0 because | |
716 | thinkpad-acpi cannot really turn the backlight off. Kernel | |
717 | power management events can temporarily increase the current | |
718 | power management level, i.e. they can dim the display. | |
719 | ||
78f81cc4 | 720 | |
24f7ff0a SS |
721 | Volume control -- /proc/acpi/ibm/volume |
722 | --------------------------------------- | |
78f81cc4 BD |
723 | |
724 | This feature allows volume control on ThinkPad models which don't have | |
725 | a hardware volume knob. The available commands are: | |
726 | ||
727 | echo up >/proc/acpi/ibm/volume | |
728 | echo down >/proc/acpi/ibm/volume | |
729 | echo mute >/proc/acpi/ibm/volume | |
730 | echo 'level <level>' >/proc/acpi/ibm/volume | |
731 | ||
732 | The <level> number range is 0 to 15 although not all of them may be | |
733 | distinct. The unmute the volume after the mute command, use either the | |
734 | up or down command (the level command will not unmute the volume). | |
735 | The current volume level and mute state is shown in the file. | |
736 | ||
ecf2a80a HMH |
737 | Fan control and monitoring: fan speed, fan enable/disable |
738 | --------------------------------------------------------- | |
fe98a52c HMH |
739 | |
740 | procfs: /proc/acpi/ibm/fan | |
741 | sysfs device attributes: (hwmon) fan_input, pwm1, pwm1_enable | |
78f81cc4 | 742 | |
ecf2a80a HMH |
743 | NOTE NOTE NOTE: fan control operations are disabled by default for |
744 | safety reasons. To enable them, the module parameter "fan_control=1" | |
745 | must be given to thinkpad-acpi. | |
78f81cc4 | 746 | |
a12095c2 HMH |
747 | This feature attempts to show the current fan speed, control mode and |
748 | other fan data that might be available. The speed is read directly | |
749 | from the hardware registers of the embedded controller. This is known | |
ecf2a80a | 750 | to work on later R, T, X and Z series ThinkPads but may show a bogus |
a12095c2 HMH |
751 | value on other models. |
752 | ||
fe98a52c | 753 | Fan levels: |
a12095c2 | 754 | |
fe98a52c HMH |
755 | Most ThinkPad fans work in "levels" at the firmware interface. Level 0 |
756 | stops the fan. The higher the level, the higher the fan speed, although | |
757 | adjacent levels often map to the same fan speed. 7 is the highest | |
758 | level, where the fan reaches the maximum recommended speed. | |
78f81cc4 | 759 | |
fe98a52c HMH |
760 | Level "auto" means the EC changes the fan level according to some |
761 | internal algorithm, usually based on readings from the thermal sensors. | |
78f81cc4 | 762 | |
fe98a52c HMH |
763 | There is also a "full-speed" level, also known as "disengaged" level. |
764 | In this level, the EC disables the speed-locked closed-loop fan control, | |
765 | and drives the fan as fast as it can go, which might exceed hardware | |
766 | limits, so use this level with caution. | |
78f81cc4 | 767 | |
fe98a52c HMH |
768 | The fan usually ramps up or down slowly from one speed to another, and |
769 | it is normal for the EC to take several seconds to react to fan | |
770 | commands. The full-speed level may take up to two minutes to ramp up to | |
771 | maximum speed, and in some ThinkPads, the tachometer readings go stale | |
772 | while the EC is transitioning to the full-speed level. | |
a12095c2 | 773 | |
78f81cc4 | 774 | WARNING WARNING WARNING: do not leave the fan disabled unless you are |
a12095c2 HMH |
775 | monitoring all of the temperature sensor readings and you are ready to |
776 | enable it if necessary to avoid overheating. | |
777 | ||
778 | An enabled fan in level "auto" may stop spinning if the EC decides the | |
779 | ThinkPad is cool enough and doesn't need the extra airflow. This is | |
780 | normal, and the EC will spin the fan up if the varios thermal readings | |
781 | rise too much. | |
782 | ||
783 | On the X40, this seems to depend on the CPU and HDD temperatures. | |
784 | Specifically, the fan is turned on when either the CPU temperature | |
785 | climbs to 56 degrees or the HDD temperature climbs to 46 degrees. The | |
786 | fan is turned off when the CPU temperature drops to 49 degrees and the | |
787 | HDD temperature drops to 41 degrees. These thresholds cannot | |
788 | currently be controlled. | |
789 | ||
fe98a52c HMH |
790 | The ThinkPad's ACPI DSDT code will reprogram the fan on its own when |
791 | certain conditions are met. It will override any fan programming done | |
792 | through thinkpad-acpi. | |
793 | ||
794 | The thinkpad-acpi kernel driver can be programmed to revert the fan | |
795 | level to a safe setting if userspace does not issue one of the procfs | |
796 | fan commands: "enable", "disable", "level" or "watchdog", or if there | |
797 | are no writes to pwm1_enable (or to pwm1 *if and only if* pwm1_enable is | |
798 | set to 1, manual mode) within a configurable amount of time of up to | |
799 | 120 seconds. This functionality is called fan safety watchdog. | |
800 | ||
801 | Note that the watchdog timer stops after it enables the fan. It will be | |
802 | rearmed again automatically (using the same interval) when one of the | |
803 | above mentioned fan commands is received. The fan watchdog is, | |
804 | therefore, not suitable to protect against fan mode changes made through | |
805 | means other than the "enable", "disable", and "level" procfs fan | |
806 | commands, or the hwmon fan control sysfs interface. | |
807 | ||
808 | Procfs notes: | |
809 | ||
810 | The fan may be enabled or disabled with the following commands: | |
811 | ||
812 | echo enable >/proc/acpi/ibm/fan | |
813 | echo disable >/proc/acpi/ibm/fan | |
814 | ||
815 | Placing a fan on level 0 is the same as disabling it. Enabling a fan | |
816 | will try to place it in a safe level if it is too slow or disabled. | |
817 | ||
a12095c2 | 818 | The fan level can be controlled with the command: |
78f81cc4 | 819 | |
fe98a52c | 820 | echo 'level <level>' > /proc/acpi/ibm/fan |
a12095c2 | 821 | |
fe98a52c HMH |
822 | Where <level> is an integer from 0 to 7, or one of the words "auto" or |
823 | "full-speed" (without the quotes). Not all ThinkPads support the "auto" | |
824 | and "full-speed" levels. The driver accepts "disengaged" as an alias for | |
825 | "full-speed", and reports it as "disengaged" for backwards | |
826 | compatibility. | |
78f81cc4 BD |
827 | |
828 | On the X31 and X40 (and ONLY on those models), the fan speed can be | |
fe98a52c | 829 | controlled to a certain degree. Once the fan is running, it can be |
78f81cc4 BD |
830 | forced to run faster or slower with the following command: |
831 | ||
fe98a52c | 832 | echo 'speed <speed>' > /proc/acpi/ibm/fan |
78f81cc4 | 833 | |
fe98a52c HMH |
834 | The sustainable range of fan speeds on the X40 appears to be from about |
835 | 3700 to about 7350. Values outside this range either do not have any | |
836 | effect or the fan speed eventually settles somewhere in that range. The | |
837 | fan cannot be stopped or started with this command. This functionality | |
838 | is incomplete, and not available through the sysfs interface. | |
78f81cc4 | 839 | |
fe98a52c HMH |
840 | To program the safety watchdog, use the "watchdog" command. |
841 | ||
842 | echo 'watchdog <interval in seconds>' > /proc/acpi/ibm/fan | |
843 | ||
844 | If you want to disable the watchdog, use 0 as the interval. | |
845 | ||
846 | Sysfs notes: | |
847 | ||
848 | The sysfs interface follows the hwmon subsystem guidelines for the most | |
849 | part, and the exception is the fan safety watchdog. | |
850 | ||
b39fe582 HMH |
851 | Writes to any of the sysfs attributes may return the EINVAL error if |
852 | that operation is not supported in a given ThinkPad or if the parameter | |
853 | is out-of-bounds, and EPERM if it is forbidden. They may also return | |
854 | EINTR (interrupted system call), and EIO (I/O error while trying to talk | |
855 | to the firmware). | |
856 | ||
857 | Features not yet implemented by the driver return ENOSYS. | |
858 | ||
fe98a52c HMH |
859 | hwmon device attribute pwm1_enable: |
860 | 0: PWM offline (fan is set to full-speed mode) | |
861 | 1: Manual PWM control (use pwm1 to set fan level) | |
862 | 2: Hardware PWM control (EC "auto" mode) | |
863 | 3: reserved (Software PWM control, not implemented yet) | |
864 | ||
b39fe582 HMH |
865 | Modes 0 and 2 are not supported by all ThinkPads, and the |
866 | driver is not always able to detect this. If it does know a | |
867 | mode is unsupported, it will return -EINVAL. | |
fe98a52c HMH |
868 | |
869 | hwmon device attribute pwm1: | |
870 | Fan level, scaled from the firmware values of 0-7 to the hwmon | |
871 | scale of 0-255. 0 means fan stopped, 255 means highest normal | |
872 | speed (level 7). | |
873 | ||
874 | This attribute only commands the fan if pmw1_enable is set to 1 | |
875 | (manual PWM control). | |
876 | ||
877 | hwmon device attribute fan1_input: | |
878 | Fan tachometer reading, in RPM. May go stale on certain | |
879 | ThinkPads while the EC transitions the PWM to offline mode, | |
880 | which can take up to two minutes. May return rubbish on older | |
881 | ThinkPads. | |
882 | ||
883 | driver attribute fan_watchdog: | |
884 | Fan safety watchdog timer interval, in seconds. Minimum is | |
885 | 1 second, maximum is 120 seconds. 0 disables the watchdog. | |
886 | ||
887 | To stop the fan: set pwm1 to zero, and pwm1_enable to 1. | |
888 | ||
889 | To start the fan in a safe mode: set pwm1_enable to 2. If that fails | |
b39fe582 HMH |
890 | with EINVAL, try to set pwm1_enable to 1 and pwm1 to at least 128 (255 |
891 | would be the safest choice, though). | |
1da177e4 | 892 | |
38f996ed | 893 | |
d3a6ade4 HMH |
894 | EXPERIMENTAL: WAN |
895 | ----------------- | |
896 | ||
897 | procfs: /proc/acpi/ibm/wan | |
cc4c24e1 | 898 | sysfs device attribute: wwan_enable |
28b779d1 SS |
899 | |
900 | This feature is marked EXPERIMENTAL because the implementation | |
901 | directly accesses hardware registers and may not work as expected. USE | |
902 | WITH CAUTION! To use this feature, you need to supply the | |
903 | experimental=1 parameter when loading the module. | |
904 | ||
d3a6ade4 HMH |
905 | This feature shows the presence and current state of a W-WAN (Sierra |
906 | Wireless EV-DO) device. | |
907 | ||
908 | It was tested on a Lenovo Thinkpad X60. It should probably work on other | |
909 | Thinkpad models which come with this module installed. | |
910 | ||
911 | Procfs notes: | |
912 | ||
913 | If the W-WAN card is installed, the following commands can be used: | |
28b779d1 SS |
914 | |
915 | echo enable > /proc/acpi/ibm/wan | |
916 | echo disable > /proc/acpi/ibm/wan | |
917 | ||
d3a6ade4 HMH |
918 | Sysfs notes: |
919 | ||
920 | If the W-WAN card is installed, it can be enabled / | |
cc4c24e1 | 921 | disabled through the "wwan_enable" thinkpad-acpi device |
d3a6ade4 HMH |
922 | attribute, and its current status can also be queried. |
923 | ||
924 | enable: | |
925 | 0: disables WWAN card / WWAN card is disabled | |
926 | 1: enables WWAN card / WWAN card is enabled. | |
927 | ||
928 | Note: this interface will be probably be superseeded by the | |
cc4c24e1 | 929 | generic rfkill class, so it is NOT to be considered stable yet. |
1da177e4 | 930 | |
78f81cc4 BD |
931 | Multiple Commands, Module Parameters |
932 | ------------------------------------ | |
1da177e4 LT |
933 | |
934 | Multiple commands can be written to the proc files in one shot by | |
935 | separating them with commas, for example: | |
936 | ||
937 | echo enable,0xffff > /proc/acpi/ibm/hotkey | |
938 | echo lcd_disable,crt_enable > /proc/acpi/ibm/video | |
939 | ||
643f12db HMH |
940 | Commands can also be specified when loading the thinkpad-acpi module, |
941 | for example: | |
1da177e4 | 942 | |
643f12db | 943 | modprobe thinkpad_acpi hotkey=enable,0xffff video=auto_disable |
1da177e4 | 944 | |
132ce091 HMH |
945 | Enabling debugging output |
946 | ------------------------- | |
947 | ||
948 | The module takes a debug paramater which can be used to selectively | |
949 | enable various classes of debugging output, for example: | |
950 | ||
951 | modprobe ibm_acpi debug=0xffff | |
952 | ||
953 | will enable all debugging output classes. It takes a bitmask, so | |
954 | to enable more than one output class, just add their values. | |
955 | ||
fe08bc4b HMH |
956 | Debug bitmask Description |
957 | 0x0001 Initialization and probing | |
958 | 0x0002 Removal | |
959 | ||
132ce091 HMH |
960 | There is also a kernel build option to enable more debugging |
961 | information, which may be necessary to debug driver problems. | |
0dcef77c | 962 | |
176750d6 HMH |
963 | The level of debugging information output by the driver can be changed |
964 | at runtime through sysfs, using the driver attribute debug_level. The | |
965 | attribute takes the same bitmask as the debug module parameter above. | |
966 | ||
0dcef77c HMH |
967 | Force loading of module |
968 | ----------------------- | |
969 | ||
970 | If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify | |
971 | the module parameter force_load=1. Regardless of whether this works or | |
972 | not, please contact ibm-acpi-devel@lists.sourceforge.net with a report. | |
176750d6 HMH |
973 | |
974 | ||
975 | Sysfs interface changelog: | |
976 | ||
977 | 0x000100: Initial sysfs support, as a single platform driver and | |
978 | device. |