Ubuntu – Upgraded to 14.10, brightness control quit working – Intel HD 4400

14.10acerintel graphics

After upgrading, I can no longer control the brightness of my monitor with Fn+⇐ and Fn+⇒.

I followed the instructions here – http://ubuntuforums.org/showthread.php?t=2144815 – but it still isn't working.

Best Answer

Open a terminal with Ctrl+Alt+T and write:

gksudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

Type in your password, then copy-paste the following text into gedit:

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

and save again!

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