Had this problem on 14.04.1 running 3.13.0-40-generic kernel. Was working previous to update a zfew days ago.
Fix is to install the indicator applet http://www.omgubuntu.co.uk/2013/04/brightness-control-ubuntu This not only allows you to change the brightness from the indicataor panel but hot keys magically work again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1391153 Title: [Lenovo ThinkPad X220] Brightness control doesn't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1391153/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
