kernel parameter intel_idle.max_cstate=4 does not help. Things do work properly if I boot with the external display plugged in to begin with.
It does appear that blindly typing the encrypted disk password still "works" and gdm does end up starting behind the black screen, but the display does not fix itself until plugging in an external monitor. booting with kernel 5.13.0-35 does not exhibit the bug (but uses the previously configured ubuntu-gnome plymouth graphics instead of the new spinner ones). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1965968 Title: post jammy update, black/flickering screen on boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1965968/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
