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- http://itsfoss.com/fix-brightness-ubuntu-1310/
- ls /sys/class/backlight/
- find graphics driver in Ubuntu
- As you can see, the output for me is dell_backlight and intel_backlight. An indicator that the graphics card in use is Intel. Another way to find out the graphics card would be to go in System Settings->Details->Graphics. You can see the graphic card in use.
- If your graphics card is Intel, you can proceed with the fix below.
- Fix brightness control issue with Intel card in Ubuntu 14.04 and Linux Mint 17:
- Open a terminal and create the following configuration file, if it does not exist:
- sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
- Now we need to edit this file. You can use any editor be it a terminal one or graphical.
- sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
- Add the following lines to this file:
- Section "Device"
- Identifier "card0"
- Driver "intel"
- Option "Backlight" "intel_backlight"
- BusID "PCI:0:2:0"
- EndSection
- Save it. Log out and log in back. The brightness control should be working through function keys now
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