Great, so we can bisect between 3.13.11.5 and 3.13.11.6. Before starting the bisect, can you also test the latest 3.13 upstream stable kernel to see if the bug has been fixed:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.7-trusty/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1370365 Title: After the last `apt-get update` the screen backlight is turned off. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1370365/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
