Control the screen brightness in Ubuntu

Matthieu Choplin

Controlling the brightness of your screen not working after installing Ubuntu on a laptop equipped with an Intel graphics card?

You can solve that through the Xorg configuration.

First, look at your PCI bus, in order to identify your card:

$ lspci | grep -i vga

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

That's how it looks on my machine. I am interested in the Intel card, so I need to remember its bus id 00:02.0.

Next you need to create the config file:

$ sudo nano /usr/share/X11/xorg.conf.d/20-intel.conf

and put the following content in, which will tell the xorg driver to use intel_backlight:

Section "Device"
        Identifier      "card0"
        Driver          "intel"
        Option          "Backlight" "intel_backlight"
        BusID           "PCI:0:2:0"
EndSection

Please note that the BusID should match.

Save, restart your Xorg:

find which display manager your ubuntu is having with following command:

$ cat /etc/X11/default-display-manager

and, for Ubuntu with LightDM:

$ sudo restart lightdm

It should then work.

Source: - https://float-middle.com/screen-brightness-on-intel-ubuntu-14-04/ - http://askubuntu.com/questions/1220/how-to-restart-x-window-server-from-command-line

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