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Lock screen without blank in 18.04
May 18, 2018
Edited: May 19, 2018
December 3, 2023
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Check the current setting using:
gsettings get org.gnome.desktop.screensaver idle-activation-enabled
If the result is
true turn it off using:
gsettings set org.gnome.desktop.screensaver idle-activation-enabled false
Second option to try is:
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false
There is a four year old Gnome bug addressing the issue of screen blanking immediately after lock here.