Ok, got it...
It was due to the triple-buffering patch that was ignoring the pending update,
see
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1441#note_1428961
** Changed in: gnome-control-center (Ubuntu)
Status: New => Won't Fix
** Changed in: mutter (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1966178
Title:
Screen-privacy couldn't work
Status in OEM Priority Project:
New
Status in gnome-control-center package in Ubuntu:
Won't Fix
Status in mutter package in Ubuntu:
In Progress
Bug description:
On ThinkPad X13 it supports 'Privacy Guard', but on jammy the g-c-c
couldn't control it.
From the GUI, I click 'Restrict Viewing Angle' on and off, there are
no change at screen.
From Fn+D, it could let screen change, and the GUI could follow the
changes.
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