I am on 3.9 kernel (for an unrelated issue) and can confirm bug exists here.
$ uname -a Linux 3.9.2-030902-generic #201305111035 SMP Sat May 11 14:36:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux I have been using this workaround: sudo bash -c '/bin/echo 0 > /sys/class/backlight/intel_backlight/brightness' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1169376 Title: XPS13 backlight stopped working after update 3.8.0-18.28 To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1169376/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
