Debian bugs: 588601, 588602: xpress 200m 5955 => resume from suspend fails with KMS enabled

[Dave Airlie]

http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commit;h=580b4fffbbdc3c899ee1f8189ba321bd60b48840

I added this qurik upstream, it may need to be extended to other rs4xx, its
worth a try.

Dave.

On Sat, Jul 10, 2010 at 4:13 PM, Andres Cimmarusti <
andrescimmarusti at yahoo.com> wrote:

> I dedicated a large portion of the day to finding a clue to this one.
> Following this advice:
> http://lxr.linux.no/#linux+v2.6.34.1/Documentation/power/s2ram.txt
> I was able to extract a trace from the failed resume process:
>
> Magic number: 0:981:799
> hash matches drivers/base/power/main.c:523
> pci 0000:01:05.0: hash matches
> ec PNP0C09:00: hash matches
>
> The first hash match is none other than my ATI Radeon card as I easily
> verified with lspci:
>
> 01:05.0 VGA compatible controller: ATI Technologies Inc Radeon XPRESS 200M
> 5955 (PCIE)
>
> However, the above link says that the likely culprit in the failed resume
> process is the last hash match. This corresponds to the EC driver:
> http://lxr.free-electrons.com/source/drivers/acpi/ec.c
>
> My card was, till recently, listed under embedded graphics at the AMD/ATI
> website. So there appears to be some conflict when using KMS between radeon
> and ec that causes the kernel to hang (that explains why I can't ssh into my
> computer to get a trace). For this reason I've cloned the original bug and
> reported the copy as a kernel bug.
> I will try to delve deeper into the matter by activating more verbose
> debugging symbols for acpi.
>
> I would appreciate some advice and guidance, since I'm flying half-blind (I
> will try to follow the information present here
> http://ubuntuforums.org/showthread.php?t=505890)
>
> Cheers,
>
> Andres
>
>
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>
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