Adjusting second monitor brightness?

I'm currently playing around with a dual-monitor setup with my laptop and a crappy dell monitor, using xinerama :
$ xrandr --output LVDS1 --mode 1280x800 --output VGA1 --mode 1280x1024 --right-of LVDS1
The only thing is that when I set the brightness, using either /sys/class/backlight/acpi_video0/brightness or xbacklight, only my laptop screen is affected. I noticed both screens have the same $DISPLAY variable so I can't use that one to maybe choose one of the screens with xbacklight -d option. Is it not possible to adjust the external monitor brightness other than physically pushing the buttons on it? Please point me in some direction. Thanks

Probably not what you want but redshift has a "-b" (brightness) option and is supposed to handle multiple monitors. (redshift will not tell the monitor to change its brightness, but rather tell the graphics card to lower the brightness... for a different result I suppose.)
Edit: the command line would look something like:
redshift -l 45:5 -t 6500:6500 -b 0.5
Last edited by stqn (2011-08-14 14:59:04)

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Adjusting second monitor brightness?

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