Thanks for the bug report.
It sounds like Xorg's (fake) brightness setting is being applied
repeatedly. I would generally recommend avoiding that feature because it
works by degrading color quality (tweaking the gamma ramps / color
profile). I recommend using your monitor's brightness setting instead.
Otherwise...
Please try uninstalling the "brightness-controller app" you mention and
reboot, then tell us if that fixes the problem. If it doesn't then we're
probably only left with Xorg or MATE to blame.
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => Low
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1960569
Title:
Screen goes dim
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