Created attachment 293297 [details]
kernel .config file of 3 PCs

(view 3 .config files)
> PC1: problem pc, Ryzen 2400GE APU with Vega 11 and 5.9.1 kernel (Xorg
> running)
> PC2: working pc, ryzen V1605 APU with vega 8 and 5.8.14 kernel (Xorg running)
> PC3: working pc, Threadripper 1950 + Fiji GPU and 5.9.1 kernel (CLI only)

As the subject states: on PC1, the kernel can't handle the radeontop program, one way or another, these methods work / do not on PC1:
> - while hardware-accelerated content is running, panic
> - When in console mode, it's fine
> - when switching from console to X, it's fine for a few moments
> - when trying it early (X running sddm, radeontop via ssh), panic

with *panic*, I mean: the PC does not react anymore: the num lock trigger is no longer working, no input is accepted, the clock on the GUI does not change anymore, no SSH.

I tried everything:
> - pstore is empty
> - dd if=/dev/kmsg of=/dev/sdb1 & while [ 1]; do echo s > /proc/sysrq-trigger;
> sleep 10; done & radeontop (and pulling it out of this partition afterwards)

The mainboard does not have a RS232 port, so debugging this way is not possible;
also, I doubt I'd be able to use KDB if the screen stucks at GUI mode ...

If I can do anything to gather more info, let me know