xbacklight and Knoppix 7.7.1

[philo]

The "No outputs have backlight property" error is apparently because xbacklight does not choose the right directory in /sys/class/backlight. Running:

ls /sys/class/backlight

shows that directory is named intel_backlight.

We should then be able to specify the directory by setting the Backlight option of the device in xorg.conf, configuring the section "Device" as follows:

/etc/X11/xorg.conf

Section "Device"
    Identifier  "Card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
EndSection