[Bug 85144] New: i965 vaapi / opengl stops working or hangs gpu at least since git commit after git1406031225.081488

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85144

            Bug ID: 85144
           Summary: i965 vaapi / opengl stops working or hangs gpu at
                    least since git commit after git1406031225.081488
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: paulo.miguel.dias at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

if i keep using mesa git, xorg git, radeon git, drm git, kernel 3.17 and above
AND intel git1406031225.081488, everything works fine:

- VAAPI works (encoding/decoding)

easily tested by using:

mpv --vo=vaapi --hwdec=vaapi file.mp4 (low cpu usage)
mpv --vo=opengl --hwdec=vaapi file.mp4 (even lower cpu usage)

- OpenGL works fine
- KWin compositing works fine, same for Unity
- Chrome HW accel works fine

NOW, if i upgrade the i965 driver to any commit past git1406031225.081488,all
hell breaks loose:

- VAAPI crashes the GPU
- Chrome hangs with segfault, GPU hangs
- KWIN compositing works
- OpenGL works for a few minutes, then the GPU crashes

i have a DELL LATITUDE 3540 (HD4400, RADEON HD8850m) hybrid

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