2 * Copyright (C) 2015 Red Hat Inc.
3 * Hans de Goede <hdegoede@redhat.com>
4 * Copyright (C) 2008 SuSE Linux Products GmbH
5 * Thomas Renninger <trenn@suse.de>
7 * May be copied or modified under the terms of the GNU General Public License
10 * After PCI devices are glued with ACPI devices
11 * acpi_get_pci_dev() can be called to identify ACPI graphics
12 * devices for which a real graphics card is plugged in
14 * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
15 * are available, video.ko should be used to handle the device.
17 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
18 * sony_acpi,... can take care about backlight brightness.
20 * Backlight drivers can use acpi_video_get_backlight_type() to determine which
21 * driver should handle the backlight. RAW/GPU-driver backlight drivers must
22 * use the acpi_video_backlight_use_native() helper for this.
24 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
25 * this file will not be compiled and acpi_video_get_backlight_type() will
26 * always return acpi_backlight_vendor.
29 #include <linux/export.h>
30 #include <linux/acpi.h>
31 #include <linux/apple-gmux.h>
32 #include <linux/backlight.h>
33 #include <linux/dmi.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
37 #include <linux/pnp.h>
38 #include <linux/types.h>
39 #include <linux/workqueue.h>
40 #include <acpi/video.h>
42 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
43 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
45 static void acpi_video_parse_cmdline(void)
47 if (!strcmp("vendor", acpi_video_backlight_string))
48 acpi_backlight_cmdline = acpi_backlight_vendor;
49 if (!strcmp("video", acpi_video_backlight_string))
50 acpi_backlight_cmdline = acpi_backlight_video;
51 if (!strcmp("native", acpi_video_backlight_string))
52 acpi_backlight_cmdline = acpi_backlight_native;
53 if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
54 acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
55 if (!strcmp("apple_gmux", acpi_video_backlight_string))
56 acpi_backlight_cmdline = acpi_backlight_apple_gmux;
57 if (!strcmp("none", acpi_video_backlight_string))
58 acpi_backlight_cmdline = acpi_backlight_none;
62 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
64 struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
68 static const struct acpi_device_id video_ids[] = {
73 if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
74 dev = acpi_get_pci_dev(handle);
78 *cap |= acpi_is_video_device(handle);
83 /* This depends on ACPI_WMI which is X86 only */
85 static bool nvidia_wmi_ec_supported(void)
87 struct wmi_brightness_args args = {
88 .mode = WMI_BRIGHTNESS_MODE_GET,
92 struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
95 status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
96 WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
97 if (ACPI_FAILURE(status))
101 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
102 * should be used, else the GPU driver(s) should be used.
104 return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
107 static bool nvidia_wmi_ec_supported(void)
113 /* Force to use vendor driver when the ACPI device is known to be
115 static int video_detect_force_vendor(const struct dmi_system_id *d)
117 acpi_backlight_dmi = acpi_backlight_vendor;
121 static int video_detect_force_video(const struct dmi_system_id *d)
123 acpi_backlight_dmi = acpi_backlight_video;
127 static int video_detect_force_native(const struct dmi_system_id *d)
129 acpi_backlight_dmi = acpi_backlight_native;
133 static int video_detect_portege_r100(const struct dmi_system_id *d)
136 /* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
137 dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
139 acpi_backlight_dmi = acpi_backlight_vendor;
143 static const struct dmi_system_id video_detect_dmi_table[] = {
145 * Models which should use the vendor backlight interface,
146 * because of broken ACPI video backlight control.
149 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
150 .callback = video_detect_force_vendor,
153 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
154 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
158 .callback = video_detect_force_vendor,
161 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
162 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
166 .callback = video_detect_force_vendor,
169 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
170 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
174 .callback = video_detect_force_vendor,
177 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
178 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
182 /* https://bugs.launchpad.net/bugs/1000146 */
183 .callback = video_detect_force_vendor,
186 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
187 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
191 .callback = video_detect_force_vendor,
194 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
199 .callback = video_detect_force_vendor,
202 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
203 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
207 /* https://bugs.launchpad.net/bugs/1000146 */
208 .callback = video_detect_force_vendor,
211 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
212 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
216 .callback = video_detect_force_vendor,
217 /* Samsung N150/N210/N220 */
219 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
220 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
221 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
225 .callback = video_detect_force_vendor,
226 /* Samsung NF110/NF210/NF310 */
228 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
229 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
230 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
234 .callback = video_detect_force_vendor,
237 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
238 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
239 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
244 * Models which should use the vendor backlight interface,
245 * because of broken native backlight control.
248 .callback = video_detect_force_vendor,
249 /* Sony Vaio PCG-FRV35 */
251 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
252 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
257 * Toshiba models with Transflective display, these need to use
258 * the toshiba_acpi vendor driver for proper Transflective handling.
261 .callback = video_detect_force_vendor,
263 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
264 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
268 .callback = video_detect_force_vendor,
270 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
271 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
276 * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
277 * vendor driver. But none of them gets activated as it has a VGA with
278 * no kernel driver (Trident CyberBlade XP4m32).
279 * The DMI strings are generic so check for the VGA chip in callback.
282 .callback = video_detect_portege_r100,
284 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
285 DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
286 DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
287 DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
292 * Models which need acpi_video backlight control where the GPU drivers
293 * do not call acpi_video_register_backlight() because no internal panel
294 * is detected. Typically these are all-in-ones (monitors with builtin
295 * PC) where the panel connection shows up as regular DP instead of eDP.
298 .callback = video_detect_force_video,
301 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
302 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
306 .callback = video_detect_force_video,
309 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
310 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
315 * These models have a working acpi_video backlight control, and using
316 * native backlight causes a regression where backlight does not work
317 * when userspace is not handling brightness key events. Disable
318 * native_backlight on these to fix this:
319 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
322 .callback = video_detect_force_video,
325 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
326 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
330 .callback = video_detect_force_video,
333 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
334 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
338 .callback = video_detect_force_video,
341 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
342 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
346 .callback = video_detect_force_video,
349 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
350 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
354 /* The native backlight controls do not work on some older machines */
356 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
357 .callback = video_detect_force_video,
358 /* HP ENVY 15 Notebook */
360 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
361 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
365 .callback = video_detect_force_video,
366 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
368 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
369 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
373 .callback = video_detect_force_video,
374 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
376 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
377 DMI_MATCH(DMI_PRODUCT_NAME,
378 "370R4E/370R4V/370R5E/3570RE/370R5V"),
382 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
383 .callback = video_detect_force_video,
384 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
386 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
387 DMI_MATCH(DMI_PRODUCT_NAME,
388 "3570R/370R/470R/450R/510R/4450RV"),
392 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
393 .callback = video_detect_force_video,
396 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
397 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
401 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
402 .callback = video_detect_force_video,
403 /* SAMSUNG 730U3E/740U3E */
405 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
406 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
410 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
411 .callback = video_detect_force_video,
412 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
414 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
415 DMI_MATCH(DMI_PRODUCT_NAME,
416 "900X3C/900X3D/900X3E/900X4C/900X4D"),
420 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
421 .callback = video_detect_force_video,
422 /* Dell XPS14 L421X */
424 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
425 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
429 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
430 .callback = video_detect_force_video,
431 /* Dell XPS15 L521X */
433 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
434 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
438 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
439 .callback = video_detect_force_video,
440 /* SAMSUNG 530U4E/540U4E */
442 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
443 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
447 /* https://bugs.launchpad.net/bugs/1894667 */
448 .callback = video_detect_force_video,
449 /* HP 635 Notebook */
451 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
452 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
456 /* Non win8 machines which need native backlight nevertheless */
458 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
459 .callback = video_detect_force_native,
460 /* Lenovo Ideapad S405 */
462 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
463 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
467 /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
468 .callback = video_detect_force_native,
469 /* Lenovo Ideapad Z470 */
471 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
472 DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
476 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
477 .callback = video_detect_force_native,
478 /* Lenovo Ideapad Z570 */
480 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
481 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
485 .callback = video_detect_force_native,
488 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
489 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
493 .callback = video_detect_force_native,
496 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
497 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
501 .callback = video_detect_force_native,
502 /* Lenovo Slim 7 16ARH7 */
504 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "82UX"),
509 .callback = video_detect_force_native,
510 /* Lenovo ThinkPad X131e (3371 AMD version) */
512 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
513 DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
517 .callback = video_detect_force_native,
520 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
521 DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
525 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
526 .callback = video_detect_force_native,
529 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
530 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
534 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
535 .callback = video_detect_force_native,
538 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
539 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
543 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
544 .callback = video_detect_force_native,
545 /* Apple MacBook Pro 12,1 */
547 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
548 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
552 .callback = video_detect_force_native,
553 /* Dell Inspiron N4010 */
555 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
556 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
560 .callback = video_detect_force_native,
561 /* Dell Vostro V131 */
563 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
564 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
568 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
569 .callback = video_detect_force_native,
570 /* Dell XPS 17 L702X */
572 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
577 .callback = video_detect_force_native,
578 /* Dell Precision 7510 */
580 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
581 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
585 .callback = video_detect_force_native,
586 /* Dell Studio 1569 */
588 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
589 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
593 .callback = video_detect_force_native,
594 /* Acer Aspire 3830TG */
596 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
601 .callback = video_detect_force_native,
602 /* Acer Aspire 4810T */
604 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
609 .callback = video_detect_force_native,
610 /* Acer Aspire 5738z */
612 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
614 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
618 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
619 .callback = video_detect_force_native,
620 /* Acer Aspire 5741 */
622 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
623 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
627 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
628 .callback = video_detect_force_native,
629 /* Acer Aspire 5750 */
631 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
632 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
636 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
637 .callback = video_detect_force_native,
638 /* Acer Extensa 5235 */
640 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
641 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
645 .callback = video_detect_force_native,
646 /* Acer TravelMate 4750 */
648 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
649 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
653 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
654 .callback = video_detect_force_native,
655 /* Acer TravelMate 5735Z */
657 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
658 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
659 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
663 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
664 .callback = video_detect_force_native,
665 /* Acer TravelMate 5760 */
667 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
668 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
672 .callback = video_detect_force_native,
673 /* ASUSTeK COMPUTER INC. GA401 */
675 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
676 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
680 .callback = video_detect_force_native,
681 /* ASUSTeK COMPUTER INC. GA502 */
683 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
684 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
688 .callback = video_detect_force_native,
689 /* ASUSTeK COMPUTER INC. GA503 */
691 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
692 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
696 .callback = video_detect_force_native,
699 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
700 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
704 .callback = video_detect_force_native,
707 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
708 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
712 .callback = video_detect_force_native,
713 /* HP EliteBook 8460p */
715 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
716 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
720 .callback = video_detect_force_native,
721 /* HP Pavilion g6-1d80nr / B4U19UA */
723 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
724 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
725 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
729 .callback = video_detect_force_native,
732 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
733 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
734 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
738 .callback = video_detect_force_native,
739 /* Samsung N145P/N250P/N260P */
741 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
742 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
743 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
747 .callback = video_detect_force_native,
750 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
751 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
752 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
756 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
757 .callback = video_detect_force_native,
758 /* Sony Vaio VPCEH3U1E */
760 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
761 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
765 .callback = video_detect_force_native,
766 /* Sony Vaio VPCY11S1E */
768 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
769 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
774 * These Toshibas have a broken acpi-video interface for brightness
775 * control. They also have an issue where the panel is off after
776 * suspend until a special firmware call is made to turn it back
777 * on. This is handled by the toshiba_acpi kernel module, so that
778 * module must be enabled for these models to work correctly.
781 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
782 .callback = video_detect_force_native,
783 /* Toshiba Portégé R700 */
785 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
786 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
790 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
791 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
792 .callback = video_detect_force_native,
793 /* Toshiba Satellite/Portégé R830 */
795 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
796 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
800 .callback = video_detect_force_native,
801 /* Toshiba Satellite/Portégé Z830 */
803 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
804 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
809 * Models which have nvidia-ec-wmi support, but should not use it.
810 * Note this indicates a likely firmware bug on these models and should
811 * be revisited if/when Linux gets support for dynamic mux mode.
814 .callback = video_detect_force_native,
817 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
818 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
822 .callback = video_detect_force_native,
824 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
825 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
830 * x86 android tablets which directly control the backlight through
831 * an external backlight controller, typically TI's LP8557.
832 * The backlight is directly controlled by the lp855x driver on these.
833 * This setup means that neither i915's native nor acpi_video backlight
834 * control works. Add a "vendor" quirk to disable both. Note these
835 * devices do not use vendor control in the typical meaning of
836 * vendor specific SMBIOS or ACPI calls being used.
839 .callback = video_detect_force_vendor,
840 /* Lenovo Yoga Book X90F / X90L */
842 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
843 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
844 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
848 .callback = video_detect_force_vendor,
850 * Lenovo Yoga Tablet 2 830F/L or 1050F/L (The 8" and 10"
851 * Lenovo Yoga Tablet 2 use the same mainboard)
854 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
855 DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
856 DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
857 /* Partial match on beginning of BIOS version */
858 DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
862 .callback = video_detect_force_vendor,
863 /* Lenovo Yoga Tab 3 Pro YT3-X90F */
865 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
866 DMI_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
867 DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
871 .callback = video_detect_force_vendor,
872 /* Xiaomi Mi Pad 2 */
874 DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
875 DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
881 static bool google_cros_ec_present(void)
883 return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
887 * Windows 8 and newer no longer use the ACPI video interface, so it often
888 * does not work. So on win8+ systems prefer native brightness control.
889 * Chromebooks should always prefer native backlight control.
891 static bool prefer_native_over_acpi_video(void)
893 return acpi_osi_is_win8() || google_cros_ec_present();
897 * Determine which type of backlight interface to use on this system,
898 * First check cmdline, then dmi quirks, then do autodetect.
900 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
902 static DEFINE_MUTEX(init_mutex);
903 static bool nvidia_wmi_ec_present;
904 static bool apple_gmux_present;
905 static bool native_available;
906 static bool init_done;
907 static long video_caps;
909 /* Parse cmdline, dmi and acpi only once */
910 mutex_lock(&init_mutex);
912 acpi_video_parse_cmdline();
913 dmi_check_system(video_detect_dmi_table);
914 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
915 ACPI_UINT32_MAX, find_video, NULL,
917 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
918 apple_gmux_present = apple_gmux_detect(NULL, NULL);
922 native_available = true;
923 mutex_unlock(&init_mutex);
926 *auto_detect = false;
929 * The below heuristics / detection steps are in order of descending
930 * presedence. The commandline takes presedence over anything else.
932 if (acpi_backlight_cmdline != acpi_backlight_undef)
933 return acpi_backlight_cmdline;
935 /* DMI quirks override any autodetection. */
936 if (acpi_backlight_dmi != acpi_backlight_undef)
937 return acpi_backlight_dmi;
942 /* Special cases such as nvidia_wmi_ec and apple gmux. */
943 if (nvidia_wmi_ec_present)
944 return acpi_backlight_nvidia_wmi_ec;
946 if (apple_gmux_present)
947 return acpi_backlight_apple_gmux;
949 /* Use ACPI video if available, except when native should be preferred. */
950 if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
951 !(native_available && prefer_native_over_acpi_video()))
952 return acpi_backlight_video;
954 /* Use native if available */
955 if (native_available)
956 return acpi_backlight_native;
959 * The vendor specific BIOS interfaces are only necessary for
960 * laptops from before ~2008.
962 * For laptops from ~2008 till ~2023 this point is never reached
963 * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
965 * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
966 * if this point is reached on those, this likely means that
967 * the GPU kms driver which sets native_available has not loaded yet.
969 * Returning acpi_backlight_vendor in this case is known to sometimes
970 * cause a non working vendor specific /sys/class/backlight device to
973 * Return acpi_backlight_none on laptops with ACPI tables written
974 * for Windows 8 (laptops from after ~2012) to avoid this problem.
976 if (acpi_osi_is_win8())
977 return acpi_backlight_none;
979 /* No ACPI video/native (old hw), use vendor specific fw methods. */
980 return acpi_backlight_vendor;
982 EXPORT_SYMBOL(__acpi_video_get_backlight_type);