Excellent - also confirming - current kernel that came through in normal
updates fixes the issue. Thank you devs.
$ uname -r
5.13.0-30-generic
I posted one option for fixing the machine on 5.11 kernel in comment
#15. To undo that:
0. update your packages
1. Restore /etc/grub/default to have the line `GRUB_DEFAULT=0`, then run `sudo
update-grub`.
3. Reboot and then confirm the with `uname -r` that you are on
5.13.0-30-generic and the issue is fixed.
4. If all is well, to remove the 5.11 packages so they're not on your system
forever: `sudo apt purge --autoremove linux-image-5.11.0-46-generic
linux-headers-5.11.0-46-generic linux-modules-extra-5.11.0-46-generic`.
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https://bugs.launchpad.net/bugs/1958591
Title:
[amdgpu] Random noise 'static' display after internal display turned
off/on
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