Lenovo S21e: brightness keys seem inversed

[^rooker]

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.

[Martin Pitt (pitti)]

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".

[^rooker (rooker)]

The issue seems to be fixed in 14.04.4 (64bit).
Just installed it fresh on another Lenovo S21e-20 (same model as previously), and brightness control now works as expected.

[Launchpad Janitor (janitor)]

[Expired for systemd (Ubuntu) because there has been no activity for 60 days.]