Sometimes when running a graphical application the display wil=
l freeze up but
system sound will continue. The machine is still functioning and is accessi=
ble
over ssh. Using ssh the following related messages are found in the output =
of
dmesg:
[drm:admgpu_job_timeout [amdgpu]] *ERROR* ring gfx timeout, signalled
seq=3D1256221, emitted seq=3D1256223
amdgpu 0000:10:00.0 GPU reset begin!
[drm:amdgpu_dm_atomic_check [amdgpu]] *ERROR* [CRTC:43:crtc-0] hw_done or
flip_done timed out
This is the output with amdgpu.gpu_recovery=3D1 set in the kernel launch
parameters. Without that the output is the same except the last two messages
are replaced with a message about GPU recovery being disabled. Any attempt =
to
access /sys/kernel/debug/dri/0/amdgpu_gpu_recover in either state hangs
forever. Magic SysRq keys still work and processes can be killed over SSH b=
ut
killing the game/Xorg/etc. will not cause the display to start working agai=
n, a
reset is required.
This has been observed with both Xorg and the KDE's Wayland compositor.
This has only been observed with Vulkan applications (native Dota 2's Vulkan
mode and DXVK backed Wine games) but hasn't been confirmed to not occur with
others.
This was observed with the libvulkan_radeon.so Mesa Vulkan driver. I couldn=
't
confirm the behavior with AMDVLK because graphical applications failed to
launch with it installed. I don't believe the GPU in question is faulty, I'=
ve
used it for long periods of time on Windows and it's rock stable.
Observed on kernels 4.18.11 and 4.19.0-rc6. Searching around the Internet
suggests this may have started with 4.18.0 but I haven't confirmed that yet.
Hardware:
CPU: AMD R7 1800X
GPU: AMD RX Vega 64