[Bug 111244] amdgpu kernel 5.2 blank display after resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111244

--- Comment #24 from miba_c at gmx.at ---
Having the same issue on a ThinkPad T495s (BIOS 1.06) with a Ryzen 7 PRO 3700U,
Kernel 5.2.8-arch1-1-ARCH, Mesa 19.1.4-1 and running sway (wayland) as a window
manager.

dmesg shows me:
[drm] Fence fallback timer expired on ring sdma0
amdgpu 0000:05:00.0: [drm:amdgpu_ib_ring_tests [amdgpu]] *ERROR* IB test failed
on gfx (-110).
[drm:amdgpu_device_ip_late_init_func_handler [amdgpu]] *ERROR* ib ring test
failed (-110).

One thing to note is that setting amd_iommu=off as a kernel parameter makes
this issue really rare but it'll still sometimes happen, maybe it's also just
luck.

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