System freeze on wake-up w/ Thunderbolt
If a 5k monitor is connected to the Thunderbolt port of, and the laptop suspends after a timeout, then a wake-up will do nothing, creating the impression that the system has frozen. The only solution is a hard reboot.
- Verify that this happens only if audio is plugged to the back of the LG Ultrafine 5k monitor.
- Gather last boot logs, and look for bug reports
Prevent idle suspend, or delay it.
services.logind.extraConfig = '' HandlePowerKey=suspend IdleAction=suspend IdleActionSec=40m '';
On GNOME, you will have to disable the naughty GDM behaviour by configuring systemd.