[Bug 68571] New: GPU lockup on AMD Radeon HD6850 with DPM=1

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68571

            Bug ID: 68571
           Summary: GPU lockup on AMD Radeon HD6850 with DPM=1
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13-rc6 / 3.12
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: kilobug@kilobug.org
        Regression: No

Hi,

When using dpm with my Radeon HD6850 I get frequent "GPU lockup", with the
screen freezing for a few seconds. Sometimes (but not often) the system
completely freezes (hard reset required). It happens both during playing OpenGL
games and during normal (not GPU intensive) activities, slightly more often
during games.

I have the issue with both kernel 3.12 (manually enabling the DPM) and 3.13-rc6
(in which it's enabled by default). With DPM disabled, all is working fine. I'm
using Mesa 10.0.1, but had the problem with Mesa 9.2.2 on kernel 3.12 too
(didn't try Mesa 9.2.2 with kernel 3.13-rc6).

I'm using Debian GNU/Linux 64-bits, all packages are from the Debian archive
(Mesa 10 and Linux 3.13-rc6 from experimental), but I don't think the problem
is Debian-specific so I prefer to report it here.

I include a "dmesg" containing two of those lockups.

The card itself is a Saphire HD6850 with 1Gb of GDDR5 memory, the CPU is a
Intel(R) Core(TM)2 Duo CPU E8400, memory is 2x2Gb of DDR2, the motherboard a
ASUSTeK P5E3. 

Feel free to ask for any additional information, or any test I could perform.

Regards,

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