Use the same BIOS, on KDE of 20.04. Attach a USB-C to DP monitor and a Lenovo dock. This issue is not reproduced.
Probably it is caused by usb-c to DP dongle or dock. Could you try unplug one or both of them? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1881213 Title: System hangs at reboot or poweroff. kworker blocked at dp_altmode_work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881213/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs