[Bug 61941] New: Random GPU lockups/resets on Mobility Radeon HD 3650 with radeon.dpm=1

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=61941

            Bug ID: 61941
           Summary: Random GPU lockups/resets on Mobility Radeon HD 3650
                    with radeon.dpm=1
           Product: Drivers
           Version: 2.5
    Kernel Version: >=3.11.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: itumaykin@gmail.com
        Regression: No

Created attachment 109311
  --> https://bugzilla.kernel.org/attachment.cgi?id=109311&action=edit
lspci -vvv

Hello.

I have 3.11 kernel with radeon.dpm enabled via kernel boot option. Sometimes
under unknown circumstances my GPU resets. It happens seldom and randomly
during a common desktop workflow: web browsing, document typing, video
playback. No games or video benchmarks or any other GPU-eating stuff.

During such lockup my screen turns black, but backlight is still on. After a
while image reappears, though it is blurry and after 10-15 seconds my screen is
back to normal state completely. Also sometimes after such reset I am able to
continue working, but sometimes screen is stuck with one image that appeared
after screen restoration and I have to reboot machine to fix this.

Everything else seems to work fine during lockups, for example music is playing
without any problems. I can't say for sure, but it looks like this bug happens
more often when some video is played in Firefox. (JIC: I don't have Adobe Flash
installed.)

My OS is Gentoo amd64 with vanilla kernel 3.11.{0,1}. And this happens with
power_dpm_state set to "balanced". I've attached two dmesg outputs after such
lockups.

I do understand that it is probably too vague description to fix this and I am
ready to provide any other additional info.

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