Also happens on Lenovo E585 with the latest firmware (R0UET74W (1.54 )), AMD
2500U w/ Vega 8, Kernel 5.3.1-arch1-1-ARCH, mesa 19.1.7-1, llvm 8.0.1. It
happens after I launched LibreOffice Sheet.

Sep 29 23:29:36 lzThinkpad gnome-shell[1676]:
meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0'
failed
Sep 29 23:29:41 lzThinkpad kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]]
*ERROR* Waiting for fences timed out or interrupted!
Sep 29 23:29:45 lzThinkpad tracker-store[1810]: OK
Sep 29 23:29:45 lzThinkpad systemd[1613]: tracker-store.service: Succeeded.
Sep 29 23:29:46 lzThinkpad kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]]
*ERROR* Waiting for fences timed out or interrupted!
Sep 29 23:29:46 lzThinkpad kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR*
ring gfx timeout, signaled seq=757, emitted seq=759
Sep 29 23:29:46 lzThinkpad kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR*
Process information: process gnome-shell pid 1676 thread gnome-shel:cs0 pid
1683
Sep 29 23:29:46 lzThinkpad kernel: [drm] GPU recovery disabled.