[Bug 109649] [raven] gfx ring timeout when running clover apps

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109649

            Bug ID: 109649
           Summary: [raven] gfx ring timeout when running clover apps
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jv356 at scarletmail.rutgers.edu

This is a regression in 4.20.x, the same userspace works ok on 4.19.
I could bisect, but it's my main machine so I can't quite dedicate the time,
any hint would be appreciated.
The kernel is booted using iommu=soft. full iommu hangs on boot, and noimmu
disables the wi-fi.

Dmesg:
> [  702.207054] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=1340, emitted seq=1342
> [  702.207061] [drm] GPU recovery disabled.

lspci -nn:
05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Device [1002:15dd] (rev c4)

It's a thinkpad e485 laptop with:
AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx (family: 0x17, model: 0x11,
stepping: 0x0)

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