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Tags: 18.04   power-management  
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Title: Ubuntu 18.04 does not suspend using physical power button of the computer when screen is locked
ID: /2019/09/23/Ubuntu-18.04-does-not-suspend-using-physical-power-button-of-the-computer-when-screen-is-locked
Created: September 23, 2019
Upload: November 24, 2022    Layout:  post
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I found a superuser answer that applies to your situation:

Someone pointed me to the file /etc/systemd/logind.conf. I was able to set parms that allowed the suspend key to work in any situation regardless what the system requests. Here is an example of my settings.

# NAutoVTs=6
# ReserveVT=6
# KillUserProcesses=no
# KillOnlyUsers=
# KillExcludeUsers=root
# InhibitDelayMaxSec=5
# HandlePowerKey=poweroff
# HandleHibernateKey=hibernate
# PowerKeyIgnoreInhibited=no
# HibernateKeyIgnoreInhibited=no
# IdleAction=ignore
# IdleActionSec=30min

For some reason a restart was not applying the changes, so I had to run the following command:

sudo systemctl restart systemd-logind
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