After analysis, I think I’m the victim of several AMD driver bugs.
In this post, I’ll present just one.
At 13:13:33, when I plugged the USB-C cable from my external monitor into my laptop.
Here are the kernel logs:
13:13:33 t14s kernel: retire_capture_urb: 58 callbacks suppressed
...
13:13:54 t14s kernel: amdgpu 0000:33:00.0: [drm] REG_WAIT timeout 1us * 100 tries - dcn31_program_compbuf_size line:141
13:13:54 t14s kernel: ------------[ cut here ]------------
13:13:54 t14s kernel: WARNING: CPU: 12 PID: 30057 at drivers/gpu/drm/amd/amdgpu/../display/dc/hubbub/dcn31/dcn31_hubbub.c:151 dcn31_program_compbuf_size+0xd1/0x230 [amdgpu]
...
More complete version of these logs: kernel.log · GitHub
I found line 151 in the source code file that generates the warning: drivers/gpu/drm/amd/display/dc/hubbub/dcn31/dcn31_hubbub.c#L151
Here’s the bug I found by searching on the keyword dcn31_program_compbuf_size: AMD GPU screen blanking for seconds with a warning
I run Fedora 40 on a ThinkPad T14 Gen3 - comes with AMD Ryzen 7 PRO 6850U with Radeon Graphics. I have my monitor connected via the ThinkPad dock, which is over a USB-C connection.
Yesterday, I updated to F41 with the 6.11.5-300.fc41 kernel. The screen blanking shot up to maybe 30x per minute, with 1-2s blanking each time, effectively giving me an unusable display.
I have the same hardware as this person and I seem to be experiencing the same problem.
However, I seem to have had gnome-shell crashes even without the action of plugging an external monitor into USB-C 
. I think I’m a victim of several bugs.
4 seconds after this warning, Discord generates a coredump :
$ coredumpctl list --since "2024-11-07"
TIME PID UID GID SIG COREFILE EXE SIZE
Thu 2024-11-07 10:09:21 CET 352125 1000 1000 SIGTRAP present /app/main/mattermost-desktop 10.6M
Thu 2024-11-07 13:13:58 CET 54929 1000 1000 SIGABRT present /usr/lib64/discord/Discord 56.9M
Here are the contents of :
$ coredumpctl info 54929 # /usr/lib64/discord/Discord
And that of
$ coredumpctl info 352125 # /app/main/mattermost-desktop
Question: would you advise me to create another thread on Fedora Discussion with the title “AMD GPU screen blanking for seconds with dcn31_program_compbuf_size warning”?