Thanks for the tip, I've disabled secure boot, restarted into 5.11 but still no HDMI connection.
$ uname -r 5.11.0-051100drmtip20210223-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1914670 Title: No HDMI detection To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1914670/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs