[Bug 69901] New: intel ivy bridge/radeonsi PRIME hang since 3.14

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=69901

            Bug ID: 69901
           Summary: intel ivy bridge/radeonsi PRIME hang since 3.14
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: haagch.christoph at googlemail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

I have these two gpus in my laptop:

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M]

With xrandr --setprovideroffloadsink radeon Intel and then DRI_PRIME=1 glxgears
it works fine on 3.13.

On 3.14-rc1 it works for a short time, but then hangs occur.

When trying with kwin it is kwin who is hanging, when trying with compton it is
actually X.
Hanging means they are unkillable, use 100% CPU (all red in htop detailed view)
and the graphical output in X is completely blocked. It seems to be luck
whether switching to a tty works.

I filed this with intel because sysprof showed the cpu usage to originate from
libdrm_intel.so when kwin hang. In the other sysprof log I did not see anything
from intel, so maybe it's not actually intel's problem.

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