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I have an old acer laptop with following graphics hardware:

00:02.0 VGA compatible controller [0300]: 
Intel Corporation System Controller Hub (SCH Poulsbo) Graphics Controller [8086:8108] (rev 07)
    Subsystem: Acer Incorporated [ALI] Device [1025:0244]

I used xbacklight's xbacklight -set XX and xbacklight -dec XX commands but they don't work. If I put these commands, the output is

No outputs have backlight property

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You should set the brightness from /sys/class/backlight/intel_backlight/brightness file, see my answer in: i3wm, adjust brightness through command line

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