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`. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1958591 Title: [amdgpu] Random noise 'static' display after internal display turned off/on To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.13/+bug/1958591/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs