acpi_sleep=s3_bios and Thinkpads

acpi_sleep=s3_bios and Thinkpads

[Matthew Garrett]

Having tested around 6 different models of Thinkpad, we've found that
passing acpi_sleep=s3_bios always helps if there is no framebuffer
running, but tends to break things if there is a framebuffer. Is this
worth some sort of DMI hackery in order to make it more likely that
things will just work?
-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org



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Re: acpi_sleep=s3_bios and Thinkpads

[Alan Cox]

On Sad, 2004-07-03 at 11:56, Matthew Garrett wrote:
> Having tested around 6 different models of Thinkpad, we've found that
> passing acpi_sleep=s3_bios always helps if there is no framebuffer
> running, but tends to break things if there is a framebuffer. Is this
> worth some sort of DMI hackery in order to make it more likely that
> things will just work?

The BIOS will re-init to vga text mode for the general case. So you'd
need instead to do some work on the pci resume path of the video drivers
to do mode resets and the like. You may also need to play
with vga routing but that ought to be set right by the BIOS.

Does switching console unbreak resume ?



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Re: acpi_sleep=s3_bios and Thinkpads

[Pavel Machek]

Hi!

> > Having tested around 6 different models of Thinkpad, we've found that
> > passing acpi_sleep=s3_bios always helps if there is no framebuffer
> > running, but tends to break things if there is a framebuffer. Is this
> > worth some sort of DMI hackery in order to make it more likely that
> > things will just work?
> 
> The BIOS will re-init to vga text mode for the general case. So you'd
> need instead to do some work on the pci resume path of the video drivers
> to do mode resets and the like. You may also need to play
> with vga routing but that ought to be set right by the BIOS.
> 
> Does switching console unbreak resume ?

Actually, on many machines video is *not* in 80x25 text mode upon
resume (Toshiba p4, arima, omnibook xe3). If it is in 80x25 text,
right thing is to enable vesafb and use s3_mode.
								Pavel

-- 
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