Here is some additional info
root@imac-XPS-13-9365:~# systemd-inhibit
WHO UID USER PID COMM WHAT
WHY
MODE
ModemManager 0 root 1257 ModemManager sleep
ModemManager needs to reset devices
delay
NetworkManager 0 root 1093 NetworkManager sleep
NetworkManager needs to turn off networks
delay
UPower 0 root 1399 upowerd sleep
Pause device polling
delay
Unattended Upgrades Shutdown 0 root 1300 unattended-upgr shutdown
Stop ongoing upgrades or perform upgrades
before shutdown delay
GNOME Shell 1000 imac 3080 gnome-shell sleep
GNOME needs to lock the screen
delay
imac 1000 imac 3221 gsd-power handle-lid-switch
External monitor attached or configuration
changed recently block
imac 1000 imac 3215 gsd-media-keys
handle-power-key:handle-suspend-key:handle-hibernate-key GNOME handling
keypresses block
imac 1000 imac 3215 gsd-media-keys sleep
GNOME handling keypresses
delay
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https://bugs.launchpad.net/bugs/1907687
Title:
Laptop with USB-C external monitors sleeping shortly after login
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