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
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https://bugs.launchpad.net/bugs/1911369
Title:
[radeon] Horizontal lines of screen corruption after last update.
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