This could be a sign that the VRAM (Video RAM on the Graphics card) is failing.
Sadly, troubleshooting this is not easy, as it can have a lot of causes and AMD is not very forthcoming with Open Source, in spite of their vocal support. Their provision is "less vocal".
You Might try:
sudo nano /etc/default/grub
Arrow key down to
"quiet splash" and add to it
radeon.runpm=0 so that it looks just like:
"quiet splash radeon.runpm=0"
Tap ctrl+x to exit, then the
y key to say yes to save, then the
enter key to save and close.
The terminal will revert to normal. Now, you must run...
Once done, reboot and test...
Is your monitor connected by USB?
Laptop normal screen
Ok, try repeating the above, but replace
So, it will look like
"quiet splash amdgpu.gartsize=0"
enter, then run
Should I revert back to default sittings?
Any settings that give you access-- And I recommend making a full back up of all personal files...
If you feel up to the stress...
You might test the following parameters:
amdgpu.vramlimit=0 amdgpu.dc=1 amdgpu.dpm=0
Lol, I just want it to live for 3 more months.