In my case it had to do something with lightDM/light-locker. I solved it by switching to gdm. On Jän 20, Carlchristian Eckert wrote: > I have the same problem since several months. Suspend to disk causes a blank > screen (as supposed to happen) and then freezes the system with 100% cpu > load. However, no useful log messages could be found, so I dropped the > issue. > > Happens on my desktop machine, no matter how I initiate the hibernation. > (pm-hibernate, systemctl hibernate, echo "disk" > /sys/power/state)
