I suffer the same problem too, adjusting the brightness via settings or keyboard doesn't actually affect screen brightness, and when it lowers brightness due to inactivity the screen flashes scaringly. Same hardware: Dell XPS13 developer edition w/ native ubuntu (upgraded to 13.04 and up-to-date).
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1183942 Title: Cannot adjust screen brightness in DELL XPS 13 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1183942/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp