Most issue with Ubuntu is brightness control. In this quick post, we will see how to fix brightness control not working for ubuntu and mint.
This bugs is relates to NVidia graphics and Intel graphics card. So to fix this issue, first you need to find out what graphics/video card that you have.
Run the command below to find out what is yours:
$ ls /sys/class/backlight
If you see output intel_backlight then Intel is your video card, if not maybe your graphics card is others.
Another way to find your graphics card is from the System Settings->Details->Graphics.
Now to fix this issue for Intel graphics card, you can proceed the fix below.
Fix brightness control issue
Open your terminal and create the following configuration file, to create the file run this command :
$ sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
Then edit the file with this command:
$ sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
Add these following lines to the file:
Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection
Save the file and logout login again. The brightness control should be working right now. If not try to restart your computer.