[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #7 from Harald Judt <h.judt at gmx.at> ---
Further tests show:

* the 0xCAFEDEAD seems to have been a one-time error that usually does not
occur
* in case of problems, "UVD not responding" does not always appear and is
successfully initialized, but the ring 5 error usually does
  radeon 0000:01:00.0: GPU lockup (waiting for 0x0000000000000008 last fence id
0x0000000000000006)
  [drm:r600_uvd_ib_test] *ERROR* radeon: fence wait failed (-35).
  [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on ring 5 (-35).
* it does not always hang when suspending, yet resume might still fail
* enabling pm_async makes suspend/resume fail sometimes with "uvd not
responding", while the process appears to be quite stable with pm_async
deactivated (may only be harder to reproduce, still needs more testing)
* hibernate/resume will fail with pm_async deactivated sometimes, and pretty
reliably with pm_async enabled

Pretty weird...

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