[Bug 198883] amdgpu: carrizo: Screen stalls after starting X

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198883

--- Comment #23 from Andrey Grodzovsky (andrey.grodzovsky at amd.com) ---
Looked a bit more into the ftraces, fence from gfx ring, context=80 seqno=10
which is a drm_sched_fence.finished fence is never signaled so next time when
same slot (slot 10) needs to be reused it waits for ever for that fence to be
signaled. finished fence is signaled once the HW fence wrappinig the IB is
signaled so looks like the related IB never completed execution.

You can try and generate  gfx ring dump with UMR tool
(https://cgit.freedesktop.org/amd/umr/)

Also try applying the attached patch to your kernel to improve UMR output

Once installed, please reproduce the issue and then attach output from
following command 

sudo umr -O verbose,follow_ib -R gfx[0:2047]

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