> I might try to set the kernel parameter next. For clarification: I would add amdgpu.mcb=0 to
> GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and then run 'sudo update-grub' (or update-grub2?).
> Afterwards I can just reboot?
Yes that sounds correct other than a typo - it should be "amdgpu.mcbp=0".
> BTW, just to rule other influences out: I do hibernate my system from time to time. This should not
> have any influence, or?
> I might try to set the kernel parameter next. For clarification: I would add amdgpu.mcb=0 to LINUX_DEFAULT in /etc/default/grub and then run 'sudo update-grub' (or update-grub2?).
> GRUB_CMDLINE_
> Afterwards I can just reboot?
Yes that sounds correct other than a typo - it should be "amdgpu.mcbp=0".
> BTW, just to rule other influences out: I do hibernate my system from time to time. This should not
> have any influence, or?
It might be a factor, if you can confirm it..?