According to this comment: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229591/comments/27
Kernel version 3.11.0-0.2 is the start of the problem., the last working saucy kernel was 3.10.0-6.17 What is next ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1447869 Title: Brightness FN keys Not working - Dell To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1447869/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs