On Чт, 2021-12-09 at 20:38 +0000, John E Bowman wrote:
> Dual monitors ViewSonic  22" monitors dimming for no reason that I can
> determine.  have to reboot to clear problem.
> 

You can call to xrandr(1) to set monitors brightness back to one.
Something like:

   xrandr --output eDP-1 --brightness 1 --output DP-1 --brightness 1

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https://bugs.launchpad.net/bugs/1943369

Title:
  mate-screensaver crashed with SIGSEGV in matemenu_tree_item_ref()

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