Next time the problem happens, does this command list any apps as
preventing the screen blanking?
gnome-session-inhibit -l
** Tags added: nvidia
** Package changed: gnome-control-center (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2088309
Title:
screen blanking does not work
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