Please try an older kernel like:

https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.89/amd64/

** Tags added: radeon

** Summary changed:

- screen corruption after last update.
+ [radeon] Horizontal lines of screen corruption after last update.

** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu)

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: xserver-xorg-video-ati (Ubuntu)

** Tags added: regression-update

** Also affects: mesa (Ubuntu)
   Importance: Undecided
       Status: New

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1911369

Title:
  [radeon] Horizontal lines of screen corruption after last update.

To manage notifications about this bug go to:
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