Yes I figured that out, managed to uninstall and remove the default kernel (5.4) and the 'bad' one (5.8.5).
Only 2 minor issues remaining: 1) Brightness setting is not persistent after reboot (it was with 5.8.5). When I turn brightness down using the quick keyboard button, it goes immediately to almost lowest, so the % of brightness is stored in the OS, but the screen itself booted with max brightness. 2) Hibernation does not work: $ sudo systemctl hibernate Failed to hibernate system via logind: Not enough swap space for hibernation Even though my /swapfile is 6.4 GB (40% of 16GB) and only 20% of my RAM is in use. Not big issues, since I can adjust brightness and I can use suspend. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893624 Title: Ryzen 4800u, kernel 5.8.5 boot errors (AMD-Vi, ACPI, HDCP, Bluetooth) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1893624/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
