[Bug 29062] New: hp dv5000: xpress 200m 5955 + KMS does not resume from suspend

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29062

           Summary: hp dv5000: xpress 200m 5955 + KMS does not resume from
                    suspend
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: acimmarusti@gmail.com


Created an attachment (id=37046)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37046)
dmesg just after failed resume

When I try suspending using KMS my computer (an HP Pavilion dv5035nr laptop)
does not resume. Furthermore I've tried logging into it remotely to obtain a
backtrace from X with no success (following this procedure:
http://ubuntuforums.org/showthread.php?t=1228332). I'm letting NetworkManager
handle my network interfaces, however, I also tried using dhcp directly in the
/etc/network/interfaces file. The laptop screen is completely blank
so I can't switch to another session. The keyboard doesn't respond so it seems
like the kernel crashed.

When using UMS the resume process happens perfectly.

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).

I would appreciate some advice and guidance in further debugging this issue,
since I'm flying half-blind. I have compiled my kernel with support for
ACPI_DEBUG and I included a quirk David Airlie used to get suspend to work with
a HP nx6125 laptop but applied for my model
(http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commit;h=580b4fffbbdc3c899ee1f8189ba321bd60b48840)

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