Is there a way to use “xrandr –brightness” on the current screen?

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I am trying to set the brightness of my built in screen using “xrandr”, but it is not working.

I am using a chromebook with duel-booted linux, and I have access to a terminal.

I am currently using

xrandr --output $($STY) --brightness 0

but my computer throws up an error saying

xrandr: unrecognized option '0'
Try 'xrandr --help' for more information.

I think that bash tries to take my current screen (0) as an argument, but I want it to be passed after “–output”.

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