[Bug 1523041] [NEW] Lenovo S21e: brightness keys seem inversed

[^rooker]

Public bug reported:

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.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Lenovo S21e: brightness keys seem inversed

Status in systemd package in Ubuntu:
  New

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.

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