xrandr --output [yourscreendevice] --set Backlight 80
However, in my case (maybe because I have 2 video adapter [cpu/amd] )
the latter xrandr command is equivalent to write in
/sys/class/backlight/acpi_video0/brightness which doesn't work.
** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1225811
Title:
1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
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