Laptop brightness is unfortunately not an attribute of the screen
itself, but of the backlight. So Linux can only easily control the
brightness of those screens with known backlight interfaces, which means
the laptop monitor only.
If you wish to adjust the brightness of any other monitor then you
should do so using the monitor's own buttons so as to not lose colour
detail. If you don't mind losing colour detail then you can also use
something like:
xrandr --output NAME --brightness VALUE
Even if interfaces did exist to implement what you want, we could still
never know the relative brightness of different models of LCD panel. So
choosing one brightness value for two different screens would be kind of
useless. Safe to say this will never be implemented, at least not as a
single brightness value.
** Changed in: gnome-control-center (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1905153
Title:
Brightness only works on one display, not two
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