[amdgpu] Screen garbled on login and freezes on resume from suspend (kernel 5.13.0-25.26~20.04.1-generic)

[Vic J]

1. The login manager works but as soon as I log in, the screen is filled with colored vertical stripes and is unusable. I found that if I change the screen resolution to the maximum (1920x1080), then the screen is ok. Any other resolution that I've tried (eg (1440x900 used to be my preference) causes the unreadable display and it does not revert back, requiring a reboot.

2. Coming out of suspend, the password entry screen is displayed, but there is no response to keyboard or mouse, requiring a reboot.

HP Envy x360 laptop with AMD Ryzen 7 with Radeon graphics

Last known kernel that worked is 5.11.0-46

[Vic J (vj777)]

I was unable to use apport - it reported 'Problem in linux-image-5.13.0-25-generic This is not an official Linux package. Please remove any third party package and try again"

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1958248

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Vic J (vj777)]

Ran log reports manually.

[Vic J (vj777)]

The 'quiet' workaround of the other bug does not help for my machine.