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

[Ingo Molnar <mingo@elte.hu>]

* 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