xbacklight and Knoppix 7.7.1

**philo** · 11-03-2016, 12:02 PM

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:

Code:

xbacklight -get

returns:

Code:

No outputs have backlight property

**philo** · 11-03-2016, 12:28 PM

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.

**philo** · 11-03-2016, 08:17 PM

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

Code:

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:

Code:

/etc/X11/xorg.conf

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

**philo** · 11-13-2016, 03:03 PM

Actually only these 2 lines need to be inserted:

Code:

 
Driver      "intel"
Option      "Backlight"  "intel_backlight"

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

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

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