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Screen turning off when idle even with power settings disabled
January 30, 2018
Edited: January 31, 2018
November 24, 2022
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This is from another answer I posted recently. You may not need the Login screen section.
Terminal CLI method
To prevent screen from turning off you need two settings, one under battery power the other when plugged into wall outlet (A/C).
For battery timeout:
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-battery-timeout <time_in_seconds>
For AC timeout:
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout <time_in_seconds>
So for both Battery and A/C set the time to 0 (never).
For Login screen:
gsettings set org.gnome.desktop.screensaver idle-activation-enabled false
Disable dimming screen when idle:
In Unix & Linux someone complained when on battery screen dims every 20 seconds and wants to turn that feature off:
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false