[Bug 108718] Raven Ridge: ring sdma0 timeout on heavy CSS website with Firefox WebRender

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108718

            Bug ID: 108718
           Summary: Raven Ridge: ring sdma0 timeout on heavy CSS website
                    with Firefox WebRender
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: samantham at posteo.net

Created attachment 142451
  --> https://bugs.freedesktop.org/attachment.cgi?id=142451&action=edit
dmesg log

This can replicated every time.
System: Lenovo A485 with 2700U APU
Kernel: 4.20.0-rc2

Steps to replicate:
1. Download Firefox Nightly from nightly.mozilla.org
2. Open Firefox Nightly
3. Type about:config in the address bar and press enter
4. Search for gfx.webrender.all in the config search box and double click the
"gfx.webrender.all" entry enable it (will show enabled after double clicking)
5. Restart Firefox Nightly
6. Browse to http://diana-adrianne.com/purecss-francine/ in Firefox Nightly
7. Screen should stop responding within a few seconds after zooming/scrolling a
bit

Result: Screen will stop responding, though the mouse cursor still moves.

dmesg output:
nov 12 14:42:15 kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0
timeout, signaled seq=20166, emitted seq=20168
nov 12 14:42:15 kernel: [drm] GPU recovery disabled.
nov 12 14:42:35 kernel: [TTM] Buffer eviction failed

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