Not xbacklight's fault.
xserver-xorg-video-intel used to offer a few methods for changing the
backlight, defaulting to platform drivers providing
/sys/class/backlight/*. With KMS the i915 driver should probably
provide a fallback if there's no platform driver for backlight.
Reference :
Answer : Bug#569892: xbacklight: after having worked before, now just prints "No outputs have backlight property"
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