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Based on kernel version 3.13. Page generated on 2014-01-20 22:04 EST.

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