[linux-block.git] / Documentation / power / video.rst

===========================
Video issues with S3 resume
===========================

2003-2006, Pavel Machek

During S3 resume, hardware needs to be reinitialized. For most
devices, this is easy, and kernel driver knows how to do
it. Unfortunately there's one exception: video card. Those are usually
initialized by BIOS, and kernel does not have enough information to
boot video card. (Kernel usually does not even contain video card
driver -- vesafb and vgacon are widely used).

This is not problem for swsusp, because during swsusp resume, BIOS is
run normally so video card is normally initialized. It should not be
problem for S1 standby, because hardware should retain its state over
that.

We either have to run video BIOS during early resume, or interpret it
using vbetool later, or maybe nothing is necessary on particular
system because video state is preserved. Unfortunately different
methods work on different systems, and no known method suits all of
them.

Userland application called s2ram has been developed; it contains long
whitelist of systems, and automatically selects working method for a
given system. It can be downloaded from CVS at
www.sf.net/projects/suspend . If you get a system that is not in the
whitelist, please try to find a working solution, and submit whitelist
entry so that work does not need to be repeated.

Currently, VBE_SAVE method (6 below) works on most
systems. Unfortunately, vbetool only runs after userland is resumed,
so it makes debugging of early resume problems
hard/impossible. Methods that do not rely on userland are preferable.

Details
~~~~~~~

There are a few types of systems where video works after S3 resume:

(1) systems where video state is preserved over S3.

(2) systems where it is possible to call the video BIOS during S3
    resume. Unfortunately, it is not correct to call the video BIOS at
    that point, but it happens to work on some machines. Use
    acpi_sleep=s3_bios.

(3) systems that initialize video card into vga text mode and where
    the BIOS works well enough to be able to set video mode. Use
    acpi_sleep=s3_mode on these.

(4) on some systems s3_bios kicks video into text mode, and
    acpi_sleep=s3_bios,s3_mode is needed.

(5) radeon systems, where X can soft-boot your video card. You'll need
    a new enough X, and a plain text console (no vesafb or radeonfb). See
    http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information.
    Alternatively, you should use vbetool (6) instead.

(6) other radeon systems, where vbetool is enough to bring system back
    to life. It needs text console to be working. Do vbetool vbestate
    save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool
    vbestate restore < /tmp/delme; setfont <whatever>, and your video
    should work.

(7) on some systems, it is possible to boot most of kernel, and then
    POSTing bios works. Ole Rohne has patch to do just that at
    http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2.

(8) on some systems, you can use the video_post utility and or
    do echo 3 > /sys/power/state  && /usr/sbin/video_post - which will
    initialize the display in console mode. If you are in X, you can switch
    to a virtual terminal and back to X using  CTRL+ALT+F1 - CTRL+ALT+F7 to get
    the display working in graphical mode again.

Now, if you pass acpi_sleep=something, and it does not work with your
bios, you'll get a hard crash during resume. Be careful. Also it is
safest to do your experiments with plain old VGA console. The vesafb
and radeonfb (etc) drivers have a tendency to crash the machine during
resume.

You may have a system where none of above works. At that point you
either invent another ugly hack that works, or write proper driver for
your video card (good luck getting docs :-(). Maybe suspending from X
(proper X, knowing your hardware, not XF68_FBcon) might have better
chance of working.

Table of known working notebooks:


=============================== ===============================================
Model                           hack (or "how to do it")
=============================== ===============================================
Acer Aspire 1406LC		ole's late BIOS init (7), turn off DRI
Acer TM 230			s3_bios (2)
Acer TM 242FX			vbetool (6)
Acer TM C110			video_post (8)
Acer TM C300                    vga=normal (only suspend on console, not in X),
				vbetool (6) or video_post (8)
Acer TM 4052LCi		        s3_bios (2)
Acer TM 636Lci			s3_bios,s3_mode (4)
Acer TM 650 (Radeon M7)		vga=normal plus boot-radeon (5) gets text
				console back
Acer TM 660			??? [#f1]_
Acer TM 800			vga=normal, X patches, see webpage (5)
				or vbetool (6)
Acer TM 803			vga=normal, X patches, see webpage (5)
				or vbetool (6)
Acer TM 803LCi			vga=normal, vbetool (6)
Arima W730a			vbetool needed (6)
Asus L2400D                     s3_mode (3) [#f2]_ (S1 also works OK)
Asus L3350M (SiS 740)           (6)
Asus L3800C (Radeon M7)		s3_bios (2) (S1 also works OK)
Asus M6887Ne			vga=normal, s3_bios (2), use radeon driver
				instead of fglrx in x.org
Athlon64 desktop prototype	s3_bios (2)
Compal CL-50			??? [#f1]_
Compaq Armada E500 - P3-700     none (1) (S1 also works OK)
Compaq Evo N620c		vga=normal, s3_bios (2)
Dell 600m, ATI R250 Lf		none (1), but needs xorg-x11-6.8.1.902-1
Dell D600, ATI RV250            vga=normal and X, or try vbestate (6)
Dell D610			vga=normal and X (possibly vbestate (6) too,
				but not tested)
Dell Inspiron 4000		??? [#f1]_
Dell Inspiron 500m		??? [#f1]_
Dell Inspiron 510m		???
Dell Inspiron 5150		vbetool needed (6)
Dell Inspiron 600m		??? [#f1]_
Dell Inspiron 8200		??? [#f1]_
Dell Inspiron 8500		??? [#f1]_
Dell Inspiron 8600		??? [#f1]_
eMachines athlon64 machines	vbetool needed (6) (someone please get
				me model #s)
HP NC6000			s3_bios, may not use radeonfb (2);
				or vbetool (6)
HP NX7000			??? [#f1]_
HP Pavilion ZD7000		vbetool post needed, need open-source nv
				driver for X
HP Omnibook XE3	athlon version	none (1)
HP Omnibook XE3GC		none (1), video is S3 Savage/IX-MV
HP Omnibook XE3L-GF		vbetool (6)
HP Omnibook 5150		none (1), (S1 also works OK)
IBM TP T20, model 2647-44G	none (1), video is S3 Inc. 86C270-294
				Savage/IX-MV, vesafb gets "interesting"
				but X work.
IBM TP A31 / Type 2652-M5G      s3_mode (3) [works ok with
				BIOS 1.04 2002-08-23, but not at all with
				BIOS 1.11 2004-11-05 :-(]
IBM TP R32 / Type 2658-MMG      none (1)
IBM TP R40 2722B3G		??? [#f1]_
IBM TP R50p / Type 1832-22U     s3_bios (2)
IBM TP R51			none (1)
IBM TP T30	236681A		??? [#f1]_
IBM TP T40 / Type 2373-MU4      none (1)
IBM TP T40p			none (1)
IBM TP R40p			s3_bios (2)
IBM TP T41p			s3_bios (2), switch to X after resume
IBM TP T42			s3_bios (2)
IBM ThinkPad T42p (2373-GTG)	s3_bios (2)
IBM TP X20			??? [#f1]_
IBM TP X30			s3_bios, s3_mode (4)
IBM TP X31 / Type 2672-XXH      none (1), use radeontool
				(http://fdd.com/software/radeon/) to
				turn off backlight.
IBM TP X32			none (1), but backlight is on and video is
				trashed after long suspend. s3_bios,
				s3_mode (4) works too. Perhaps that gets
				better results?
IBM Thinkpad X40 Type 2371-7JG  s3_bios,s3_mode (4)
IBM TP 600e			none(1), but a switch to console and
				back to X is needed
Medion MD4220			??? [#f1]_
Samsung P35			vbetool needed (6)
Sharp PC-AR10 (ATI rage)	none (1), backlight does not switch off
Sony Vaio PCG-C1VRX/K		s3_bios (2)
Sony Vaio PCG-F403		??? [#f1]_
Sony Vaio PCG-GRT995MP		none (1), works with 'nv' X driver
Sony Vaio PCG-GR7/K		none (1), but needs radeonfb, use
				radeontool (http://fdd.com/software/radeon/)
				to turn off backlight.
Sony Vaio PCG-N505SN		??? [#f1]_
Sony Vaio vgn-s260		X or boot-radeon can init it (5)
Sony Vaio vgn-S580BH		vga=normal, but suspend from X. Console will
				be blank unless you return to X.
Sony Vaio vgn-FS115B		s3_bios (2),s3_mode (4)
Toshiba Libretto L5		none (1)
Toshiba Libretto 100CT/110CT    vbetool (6)
Toshiba Portege 3020CT		s3_mode (3)
Toshiba Satellite 4030CDT	s3_mode (3) (S1 also works OK)
Toshiba Satellite 4080XCDT      s3_mode (3) (S1 also works OK)
Toshiba Satellite 4090XCDT      ??? [#f1]_
Toshiba Satellite P10-554       s3_bios,s3_mode (4)[#f3]_
Toshiba M30                     (2) xor X with nvidia driver using internal AGP
Uniwill 244IIO			??? [#f1]_
=============================== ===============================================

Known working desktop systems
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

=================== ============================= ========================
Mainboard	    Graphics card                 hack (or "how to do it")
=================== ============================= ========================
Asus A7V8X	    nVidia RIVA TNT2 model 64	  s3_bios,s3_mode (4)
=================== ============================= ========================


.. [#f1] from https://wiki.ubuntu.com/HoaryPMResults, not sure
         which options to use. If you know, please tell me.

.. [#f2] To be tested with a newer kernel.

.. [#f3] Not with SMP kernel, UP only.
Commit	Line	Data
151f4e2b MCC	1	===========================
	2	Video issues with S3 resume
	3	===========================
1da177e4	4
151f4e2b	5	2003-2006, Pavel Machek
1da177e4 LT	6
	7	During S3 resume, hardware needs to be reinitialized. For most
	8	devices, this is easy, and kernel driver knows how to do
	9	it. Unfortunately there's one exception: video card. Those are usually
	10	initialized by BIOS, and kernel does not have enough information to
	11	boot video card. (Kernel usually does not even contain video card
	12	driver -- vesafb and vgacon are widely used).
	13
	14	This is not problem for swsusp, because during swsusp resume, BIOS is
36fabc24 PM	15	run normally so video card is normally initialized. It should not be
	16	problem for S1 standby, because hardware should retain its state over
	17	that.
1da177e4	18
543cc27d	19	We either have to run video BIOS during early resume, or interpret it
992caacf	20	using vbetool later, or maybe nothing is necessary on particular
543cc27d PM	21	system because video state is preserved. Unfortunately different
	22	methods work on different systems, and no known method suits all of
	23	them.
	24
	25	Userland application called s2ram has been developed; it contains long
	26	whitelist of systems, and automatically selects working method for a
	27	given system. It can be downloaded from CVS at
	28	www.sf.net/projects/suspend . If you get a system that is not in the
	29	whitelist, please try to find a working solution, and submit whitelist
	30	entry so that work does not need to be repeated.
	31
	32	Currently, VBE_SAVE method (6 below) works on most
	33	systems. Unfortunately, vbetool only runs after userland is resumed,
	34	so it makes debugging of early resume problems
	35	hard/impossible. Methods that do not rely on userland are preferable.
	36
	37	Details
	38	~~~~~~~
	39
1da177e4 LT	40	There are a few types of systems where video works after S3 resume:
	41
	42	(1) systems where video state is preserved over S3.
	43
	44	(2) systems where it is possible to call the video BIOS during S3
151f4e2b MCC	45	resume. Unfortunately, it is not correct to call the video BIOS at
	46	that point, but it happens to work on some machines. Use
	47	acpi_sleep=s3_bios.
1da177e4 LT	48
1da177e4 LT	49	(3) systems that initialize video card into vga text mode and where
151f4e2b MCC	50	the BIOS works well enough to be able to set video mode. Use
151f4e2b MCC	51	acpi_sleep=s3_mode on these.
1da177e4 LT	52
1da177e4 LT	53	(4) on some systems s3_bios kicks video into text mode, and
151f4e2b	54	acpi_sleep=s3_bios,s3_mode is needed.
1da177e4 LT	55
1da177e4 LT	56	(5) radeon systems, where X can soft-boot your video card. You'll need
151f4e2b MCC	57	a new enough X, and a plain text console (no vesafb or radeonfb). See
	58	http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information.
	59	Alternatively, you should use vbetool (6) instead.
1da177e4 LT	60
1da177e4 LT	61	(6) other radeon systems, where vbetool is enough to bring system back
151f4e2b MCC	62	to life. It needs text console to be working. Do vbetool vbestate
	63	save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool
	64	vbestate restore < /tmp/delme; setfont <whatever>, and your video
	65	should work.
1da177e4 LT	66
1da177e4 LT	67	(7) on some systems, it is possible to boot most of kernel, and then
151f4e2b MCC	68	POSTing bios works. Ole Rohne has patch to do just that at
151f4e2b MCC	69	http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2.
1da177e4	70
151f4e2b MCC	71	(8) on some systems, you can use the video_post utility and or
	72	do echo 3 > /sys/power/state && /usr/sbin/video_post - which will
	73	initialize the display in console mode. If you are in X, you can switch
	74	to a virtual terminal and back to X using CTRL+ALT+F1 - CTRL+ALT+F7 to get
	75	the display working in graphical mode again.
7e958883	76
1da177e4 LT	77	Now, if you pass acpi_sleep=something, and it does not work with your
	78	bios, you'll get a hard crash during resume. Be careful. Also it is
	79	safest to do your experiments with plain old VGA console. The vesafb
	80	and radeonfb (etc) drivers have a tendency to crash the machine during
	81	resume.
	82
	83	You may have a system where none of above works. At that point you
	84	either invent another ugly hack that works, or write proper driver for
	85	your video card (good luck getting docs :-(). Maybe suspending from X
	86	(proper X, knowing your hardware, not XF68_FBcon) might have better
	87	chance of working.
	88
36fabc24	89	Table of known working notebooks:
1da177e4	90
151f4e2b MCC	91
151f4e2b MCC	92	=============================== ===============================================
1da177e4	93	Model hack (or "how to do it")
151f4e2b	94	=============================== ===============================================
1da177e4	95	Acer Aspire 1406LC ole's late BIOS init (7), turn off DRI
e084dbd3	96	Acer TM 230 s3_bios (2)
1da177e4	97	Acer TM 242FX vbetool (6)
7e958883	98	Acer TM C110 video_post (8)
151f4e2b MCC	99	Acer TM C300 vga=normal (only suspend on console, not in X),
151f4e2b MCC	100	vbetool (6) or video_post (8)
1da177e4	101	Acer TM 4052LCi s3_bios (2)
36fabc24	102	Acer TM 636Lci s3_bios,s3_mode (4)
151f4e2b MCC	103	Acer TM 650 (Radeon M7) vga=normal plus boot-radeon (5) gets text
	104	console back
	105	Acer TM 660 ??? [#f1]_
	106	Acer TM 800 vga=normal, X patches, see webpage (5)
	107	or vbetool (6)
	108	Acer TM 803 vga=normal, X patches, see webpage (5)
	109	or vbetool (6)
1da177e4 LT	110	Acer TM 803LCi vga=normal, vbetool (6)
1da177e4 LT	111	Arima W730a vbetool needed (6)
151f4e2b	112	Asus L2400D s3_mode (3) [#f2]_ (S1 also works OK)
a4ffad5b	113	Asus L3350M (SiS 740) (6)
1da177e4	114	Asus L3800C (Radeon M7) s3_bios (2) (S1 also works OK)
151f4e2b MCC	115	Asus M6887Ne vga=normal, s3_bios (2), use radeon driver
151f4e2b MCC	116	instead of fglrx in x.org
1da177e4	117	Athlon64 desktop prototype s3_bios (2)
151f4e2b	118	Compal CL-50 ??? [#f1]_
1da177e4 LT	119	Compaq Armada E500 - P3-700 none (1) (S1 also works OK)
	120	Compaq Evo N620c vga=normal, s3_bios (2)
	121	Dell 600m, ATI R250 Lf none (1), but needs xorg-x11-6.8.1.902-1
	122	Dell D600, ATI RV250 vga=normal and X, or try vbestate (6)
151f4e2b MCC	123	Dell D610 vga=normal and X (possibly vbestate (6) too,
	124	but not tested)
	125	Dell Inspiron 4000 ??? [#f1]_
	126	Dell Inspiron 500m ??? [#f1]_
2a962065	127	Dell Inspiron 510m ???
e084dbd3	128	Dell Inspiron 5150 vbetool needed (6)
151f4e2b MCC	129	Dell Inspiron 600m ??? [#f1]_
	130	Dell Inspiron 8200 ??? [#f1]_
	131	Dell Inspiron 8500 ??? [#f1]_
	132	Dell Inspiron 8600 ??? [#f1]_
	133	eMachines athlon64 machines vbetool needed (6) (someone please get
	134	me model #s)
	135	HP NC6000 s3_bios, may not use radeonfb (2);
	136	or vbetool (6)
	137	HP NX7000 ??? [#f1]_
	138	HP Pavilion ZD7000 vbetool post needed, need open-source nv
	139	driver for X
1da177e4 LT	140	HP Omnibook XE3 athlon version none (1)
1da177e4 LT	141	HP Omnibook XE3GC none (1), video is S3 Savage/IX-MV
e084dbd3	142	HP Omnibook XE3L-GF vbetool (6)
543cc27d	143	HP Omnibook 5150 none (1), (S1 also works OK)
151f4e2b MCC	144	IBM TP T20, model 2647-44G none (1), video is S3 Inc. 86C270-294
	145	Savage/IX-MV, vesafb gets "interesting"
	146	but X work.
	147	IBM TP A31 / Type 2652-M5G s3_mode (3) [works ok with
	148	BIOS 1.04 2002-08-23, but not at all with
	149	BIOS 1.11 2004-11-05 :-(]
1da177e4	150	IBM TP R32 / Type 2658-MMG none (1)
151f4e2b	151	IBM TP R40 2722B3G ??? [#f1]_
1da177e4	152	IBM TP R50p / Type 1832-22U s3_bios (2)
a4ffad5b	153	IBM TP R51 none (1)
151f4e2b	154	IBM TP T30 236681A ??? [#f1]_
1da177e4 LT	155	IBM TP T40 / Type 2373-MU4 none (1)
	156	IBM TP T40p none (1)
	157	IBM TP R40p s3_bios (2)
	158	IBM TP T41p s3_bios (2), switch to X after resume
a4ffad5b	159	IBM TP T42 s3_bios (2)
1da177e4	160	IBM ThinkPad T42p (2373-GTG) s3_bios (2)
151f4e2b	161	IBM TP X20 ??? [#f1]_
9587c4bf	162	IBM TP X30 s3_bios, s3_mode (4)
151f4e2b MCC	163	IBM TP X31 / Type 2672-XXH none (1), use radeontool
	164	(http://fdd.com/software/radeon/) to
	165	turn off backlight.
	166	IBM TP X32 none (1), but backlight is on and video is
	167	trashed after long suspend. s3_bios,
	168	s3_mode (4) works too. Perhaps that gets
	169	better results?
1da177e4	170	IBM Thinkpad X40 Type 2371-7JG s3_bios,s3_mode (4)
151f4e2b MCC	171	IBM TP 600e none(1), but a switch to console and
	172	back to X is needed
	173	Medion MD4220 ??? [#f1]_
1da177e4	174	Samsung P35 vbetool needed (6)
543cc27d	175	Sharp PC-AR10 (ATI rage) none (1), backlight does not switch off
374a6cf2	176	Sony Vaio PCG-C1VRX/K s3_bios (2)
151f4e2b	177	Sony Vaio PCG-F403 ??? [#f1]_
543cc27d	178	Sony Vaio PCG-GRT995MP none (1), works with 'nv' X driver
151f4e2b MCC	179	Sony Vaio PCG-GR7/K none (1), but needs radeonfb, use
	180	radeontool (http://fdd.com/software/radeon/)
	181	to turn off backlight.
	182	Sony Vaio PCG-N505SN ??? [#f1]_
1da177e4	183	Sony Vaio vgn-s260 X or boot-radeon can init it (5)
151f4e2b MCC	184	Sony Vaio vgn-S580BH vga=normal, but suspend from X. Console will
151f4e2b MCC	185	be blank unless you return to X.
543cc27d	186	Sony Vaio vgn-FS115B s3_bios (2),s3_mode (4)
1da177e4	187	Toshiba Libretto L5 none (1)
e084dbd3	188	Toshiba Libretto 100CT/110CT vbetool (6)
543cc27d PM	189	Toshiba Portege 3020CT s3_mode (3)
	190	Toshiba Satellite 4030CDT s3_mode (3) (S1 also works OK)
	191	Toshiba Satellite 4080XCDT s3_mode (3) (S1 also works OK)
151f4e2b MCC	192	Toshiba Satellite 4090XCDT ??? [#f1]_
151f4e2b MCC	193	Toshiba Satellite P10-554 s3_bios,s3_mode (4)[#f3]_
2a962065	194	Toshiba M30 (2) xor X with nvidia driver using internal AGP
151f4e2b MCC	195	Uniwill 244IIO ??? [#f1]_
151f4e2b MCC	196	=============================== ===============================================
1da177e4	197
36fabc24 PM	198	Known working desktop systems
	199	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	200
151f4e2b	201	=================== ============================= ========================
36fabc24	202	Mainboard Graphics card hack (or "how to do it")
151f4e2b	203	=================== ============================= ========================
36fabc24	204	Asus A7V8X nVidia RIVA TNT2 model 64 s3_bios,s3_mode (4)
151f4e2b	205	=================== ============================= ========================
36fabc24	206
1da177e4	207
151f4e2b MCC	208	.. [#f1] from https://wiki.ubuntu.com/HoaryPMResults, not sure
151f4e2b MCC	209	which options to use. If you know, please tell me.
1da177e4	210
151f4e2b	211	.. [#f2] To be tested with a newer kernel.
1da177e4	212
151f4e2b	213	.. [#f3] Not with SMP kernel, UP only.