xbacklight - No outputs have backlight property

Question

I am running Lubuntu 16.04

Attempting to run xbacklight -get gives me No outputs have backlight property

There is only one directory in /sys/class/backlight, which is intel_backlight.

I have created an xorg.conf in /etc/X11:

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

Yet still no change.

Any suggestions?

Solution

I don't know if you've solved this yet, but I was able to get to work by changing the name of the folder.

Section "Device"
        Identifier      "Card0"
        Driver          "intel"
        Option          "Backlight"     "/sys/class/backlight/intel_backlight"
EndSection

I logged out after changing the path and when I logged back in xbacklight was working at is should. (I'm running Xubuntu 16.04 and I don't know if that makes much of a difference.)

Comments

[cgogolin]

I have exactly the same problem (under Debian) since the upgrade to the 4.6.0-1 kernel. Did you find any solution?

[Brian Pursley]

I'm not the OP, but on ubuntu 18, I put this in /usr/share/X11/xorg.conf.d/20-intel-brightness.conf and it worked for me. Thanks!

[Timo]

lubuntu 20_04, I have these files in /usr/share/X11/xorg.conf.d, but no intel: 10-amdgpu.conf 10-quirks.conf 10-radeon.conf 40-libinput.conf 70-wacom.conf. How can I move forward?

[Amir Shabani]

Works on Debian too.