Critical update on hardware symptoms: I've confirmed that all USB Type-C ports are non-functional on this system.
This correlates with the kernel error: Serial bus multi instantiate pseudo device driver INT3515:00: error -ENXIO: IRQ index 1 not found. The monitor is connected via DisplayPort. The failure of the UCSI driver (INT3515) might be causing a cascade failure in power management, preventing the GPU from re-initializing the DisplayPort link after the monitor is turned off or the system attempts to sleep. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2144584 Title: Suspend/Hibernate missing from GNOME menu and causing hard freeze due to Kernel Lockdown (Secure Boot) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2144584/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
