I have experienced the same problem on a Lenovo X220t, but could not
reproduce it now after the latest kernel update (3.13.0-34.60).
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
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https://bugs.launchpad.net/bugs/1308674
Title:
[Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken
when going from docked -> undocked
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