Please install evtest, run "sudo evtest", pick the plausible device (there might be several, and if you don't get events on one, try with another), press the two brightness keys, and copy&paste the output here. Please annotate the output with which key you actually pressed (i. e. "this is the output after pressing britghtness down:").
Finally, please give me the output of "cat /sys/class/dmi/id/modalias". ** Changed in: systemd (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1523041 Title: Lenovo S21e: brightness keys seem inversed Status in systemd package in Ubuntu: Incomplete Bug description: Fresh install of Xubuntu Trusty (14.04.3 64bit) on a Lenovo S21e. The brightness +/- keys work, but their function seems to be reversed: - minus makes it brighter - plus makes it darker Additionally, the screen goes completely off (no backlight) when reaching the lowest or highest brightness step. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1523041/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp