If you are getting frequent emails then perhaps that is keeping the
display awake.
Please try turning off the options in Settings > Notifications >
Thunderbird
** Package changed: gdm3 (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1987201
Title:
Screen blanking no longer works after Thunderbird "new email" alert
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