Blank display on Ubuntu 19.10 on Ryzen 3 2200G and Ryzen 5 2400G APUs

Submitted by mor..@..il.com

Assigned to Default DRI bug account

Link to original bug (#112288)

Description

Filing bug report here on request by Ubuntu bug team, please see discussion on https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1848900

My problem arose after upgrading Ubuntu 19.04 -> 19.10. The lighted welcome screen displays fine, but when I try to log in I get a black screen and the monitor appears to be frozen (can't switch to virtual terminal either). The machine is running normally and I can log on via ssh.

Other users in the above mentioned bug on LP have different variations of the same problems, some have problems using the live DVD.