I've discovered some useful info about this bug. First, there's a forum thread about it with lots of good info: https://ubuntu- mate.community/t/20-04-display-issues-with-amd-gpu/21648/37
Second, a new workaround. To recap, the first workaround I found was booting with nomodeset, but that disables all hardware acceleration. The new workaround, as detailed in the forum thread, is to open MATE Tweak, and in the Windows tab, change the window manager to Marco (no compositor). Third, we found the upstream bug in xf86-video-amdgpu: https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues/10 . I believe this is packaged as xserver-xorg-video-amdgpu in Ubuntu. It's been fixed upstream and the Ubuntu Mate devs will include it in 20.04.1 is possible. Fourth, bug #1873895 appears to be the same bug, but originally reported as manifesting in Xubuntu. Maybe this is a duplicate. ** Bug watch added: gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues #10 https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues/10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1882525 Title: [amdgpu] MATE desktop is corrupted upon login on Ryzen APU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/marco/+bug/1882525/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
