After a recent upgrade (I think 4.1.2021), the system started to freeze when
screen saver started. I had a suspicion with power-saving and disabled screen
dim function, that solved this problem, but I have noticed, that the system
froze also after wake up from sleep (suspend to RAM) and also when I plugged in
external HDMI beamer. My hardware is lenovo X1.
When looking at logs I found nothing suspicious:
2021-01-07T09:05:28.131783+01:00 brko-notebook chronyd[780]: Source
62.168.65.36 offline
2021-01-07T09:05:28.132198+01:00 brko-notebook chronyd[780]: Source 46.29.2.171
offline
2021-01-07T09:05:28.132419+01:00 brko-notebook chronyd[780]: Can't synchronise:
no selectable sources
2021-01-07T09:05:28.136878+01:00 brko-notebook kded5[1557]: plasma-nm: Not
emitting connection deactivated notification as we're about to suspend
2021-01-07T09:05:28.138183+01:00 brko-notebook systemd[1]: Reached target
Sleep.
2021-01-07T09:05:28.142508+01:00 brko-notebook systemd[1]: Starting Suspend...
2021-01-07T09:05:28.185368+01:00 brko-notebook systemd-sleep[8439]: INFO: Skip
running /usr/lib/systemd/system-sleep/grub2.sleep for suspend
2021-01-07T09:05:28.188613+01:00 brko-notebook systemd-sleep[8434]: Suspending
system...
2021-01-07T09:05:28.188776+01:00 brko-notebook kernel: [ 1625.713697] PM:
suspend entry (s2idle)
2021-01-07T09:10:41.253275+01:00 brko-notebook systemd[1]: Queued start job for
default target Graphical Interface.
2021-01-07T09:10:41.253333+01:00 brko-notebook systemd[1]:
systemd-journald.service: Succeeded.
2021-01-07T09:10:41.253358+01:00 brko-notebook haveged[477]: haveged: command
socket is listening at fd 3
2021-01-07T09:10:41.253364+01:00 brko-notebook systemd[1]: Activated swap
/dev/disk/by-uuid/a8fee06a-e4e4-477b-927e-ce7691143519.
2021-01-07T09:10:41.253368+01:00 brko-notebook systemd[1]: Mounted /.snapshots.