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I have two displays. I can successfully set brightness for the first display using e.g. xbacklight -set 30, but I cannot dim my second display connected to HDMI. I tried xbacklight -display HDMI1 -set 30, and xbacklight -display 1 -set 30, but I've got RANDR Query Version returned error -1 in both cases.

What do I have to write as the -display parameter?

P.S. 

xrandr --listmonitors
Monitors: 1
 0: +*HDMI1 1920/527x1080/296+0+0  HDMI1

The following command works perfectly:

xrandr --output HDMI1 --brightness 0.3
max5555
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1 Answers1

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This option is now deprecated. From man xbacklight:

-display IGNORED
       Ignored for backward compatibility.

You must use xrandr

Marco Di Francesco
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