xbacklight and Knoppix 7.7.1

ON the same computer, xbacklight was working well with Knoppix 7.4 and 7.6.

It is not working for Knoppix 7.7.1. The command:

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xbacklight -get

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returns:

Code:

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No outputs have backlight property

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As a followup, using the function keys for brightness (in my case: fn+Alt+F5 or F6) seems to be remembered. So, at least for me, there is a workaround.

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

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ls /sys/class/backlight

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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:

Code:

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/etc/X11/xorg.conf

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

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Actually only these 2 lines need to be inserted:

Code:

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Driver      "intel"
Option      "Backlight"  "intel_backlight"

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Should also have mentioned the link for the solution to that issue:

https://wiki.archlinux.org/index.php...ght#xbacklight