[Bug 112377] [TGL] media VME encoding GPU hang w/o i915 error state captured

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112377

--- Comment #10 from Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com> ---
The command line I provided uses the smallest possible video. So, batches
should be executed instantaneous, much less than 100ms. Actually I would like
to point out 2 issues here:
1. Media fails on the key use case
2. i915 driver hides GPU hang and does not provide a way to get the error dump

The first one is critical for TGL program.

The second one is critical in a longer term - how we are supposed to debug
hangs? I strongly suggest to either change/fix the behavior and allow dumps or
introduce special i915 module parameter to again allow dumps. In case of a
parameter I would suggest to print message into dmesg log to suggest user rerun
workload with this parameter and capture dump.

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