Ubuntu – Ubuntu 20.04 graphics problems with AMD R9 380


Just installed Ubuntu 20.04 as a dual boot with Windows 10. When I ran the installer from a USB drive, I got a black screen until I rebooted and chose the "safe graphics" (I think that's what it was called anyway) option. This gave me a low-res display that was fine to install.

Now that the install is complete, on booting I again get a black screen. I can get past this by adding the nomodeset option. With this I get something on screen, but it's low resolution and quite terrible.

It seems that there is a driver problem with my AMD Radeon R9 380 card. The additional drivers tool doesn't offer me anything to install.

Details of my machine:

Best Answer

I had fought this for hours before posting my question, and then found the solution minutes afterwards.

All I had to do was add the amdgpu.dc=0 kernel option, and it now seems to work. I'm not really sure why this is needed, though.