Bug#390913: xserver-xorg-video-i810: blank screen after suspend

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

Adrian Glaubitz wrote:
> Ok, I have installed the version from experimental (2:2.0.0-5). The
> problem
> still persists, i.e. the screen is blank (it's just the LCD backlight
> which
> is not turned on, you can a dim picture) upon resume but I can get it
> back with "vbetool post" *and* switching to and fro a text-console
> (vbetool alone won't do it).
>
> Passing "acpi_sleep=s3_bios" will also fix it and *without* the need
> of extra
> console-switching. So 2:2.0.0-5 + "acpi_sleep=s3_bios" work perfectly :).

Good to know, thanks.

> But why would I still need to pass the extra kernel command-line, can't
> you take care of this within the driver code ?

I don't know exactly, but I guess "acpi_sleep=s3_bios" changes the way
the kernel restores things. The Xorg driver is far away from this kernel
code (it does not run in kernel space, and it's very late in resume
process). I think it's very common (not intel-chipset specific) to have
to pass such an option to get resume to work.

Brice