Re: [2/6] 2.6.21-rc2: known regressions

Ingo Molnar
2007-03-09T11:01:06Z

* Linus Torvalds <torvalds@linux-foundation.org> wrote:

> > disabling the following radeonfb options in the .config made resume
> > work again:
>
> In general, don't even *try* to use radeonfb for suspend/resume.
>
> I don't think it has ever worked, except on some very rare laptops
> (largely PPC Macs) where people had enough information to set up the
> PLL's.
>
> I don't think the other framebuffer drivers are much better.
>
> You're better off using the VGA console, and lettign X re-initialize
> the graphics device. That generally at least has a reasonably good
> chance of working.
>
> Re-initializing graphics modes really is very hard. You can try with
> the BIOS video hack (I forget the kernel command line to turn it on),
> but we really do end up depending on X doing it better.

it's the s3_sleep boot option and /proc/sys/kernel/acpi_video_mode, but
that didnt make a difference.

> Some day we may have modesetting support in the kernel for some
> graphics hw, right now it's pretty damn spotty.

having no video is what i'd have expected - but getting a /hang/ is not
what i'd have expected.

Ingo