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.

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  Lenovo S21e: brightness keys seem inversed

Status in systemd package in Ubuntu:

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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