(In reply to Sandeep from comment #209)
> Created attachment 141193 [details]
> attachment-13440-0.html
> 
> Try removing the amdgpu.dc=1 kernel parameter. Might be causing problems.
> If not, then it's a bug in the driver.

THANK YOU

Now it works. Looks like the DC code was causing troubles.

This is my current configuration for grub
GRUB_CMDLINE_LINUX_DEFAULT="radeon.cik_support=0 amdgpu.cik_support=1
amdgpu.modeset=1 amdgpu.dc=0 amdgpu.dpm=1"
I'm on kernel 4.18.3.

I left the PC running for hours and it didn't freeze. This was simply
impossible before the new changes.

I also tried reducing the monitor shutdown to 1 minute, and it worked every
single time I left it idle.

I think that I can finally confirm I'm no longer able to reproduce this bug,
after 2 and a half years of using this card, and trying new kernels once a
month.