This also affects ThinkPad T430s but is even more visible. On kernel 3.8 I have 10 levels of brightness available when using function keys. On 3.11 I can only get 4 levels when using function keys but indicator has 17 steps (so most key presses only result in indicator change and no brightness change).
I found workaround in a similar bug #1098216 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098216/comments/114): sudo sh -c 'echo -n 0 > /sys/module/video/parameters/brightness_switch_enabled' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1226191 Title: Brightness Control regression in 3.11 on Thinkpad X230 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1226191/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
