I also have a 3400G with a freezing bug. Two questions to help establish
whether it's the same bug:
> The system has been crashing (no response to mouse/keyboard, but the
screen seems to still be updating).
When you say the screen is updating, what exactly do you mean, please?
My bug means the screen blanks to black, then returns to where it was
(or an earlier frame), and the mouse cursor moves. But actually, it's a
graphics crash: Clicking on buttons etc. has no effect and if I use the
keyboard to open a Terminal (Ctrl+Alt+T) and reboot, I get a response
about half the time. This is consistent with what I see in the SysLog,
which reports a series of amdgpu crashes and failed resets.
> I see a lot of junk in dmesg about amdgpu.
Are you seeing messages like these or something different, please?:
[drm:amdgpu_dm_commit_planes.constprop.0 [amdgpu]] *ERROR* Waiting for fences
timed out!
Apr 5 01:12:11 paul kernel: [ 285.638026] [drm:amdgpu_job_timedout [amdgpu]]
*ERROR* ring gfx timeout, signaled seq=92956, emitted seq=92958
Apr 5 01:12:11 paul kernel: [ 285.638075] [drm:amdgpu_job_timedout [amdgpu]]
*ERROR* Process information: process RLTM3.exe pid 3670 thread RLTM3.exe:cs0
pid 3700
Apr 5 01:12:11 paul kernel: [ 285.638078] amdgpu :27:00.0: amdgpu: GPU
reset begin!
It might help you to know that many people with amdgpu bugs in Ryzen
report that setting the kernel parameter iommu=pt fixes them, though
this does not help me.
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https://bugs.launchpad.net/bugs/1863385
Title:
System is generally unstable with amdgpu errors in syslog
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