[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 #25 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to miba_c from comment #24)
> 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.

Please attach full log, also it looks log.

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