I have an X220 running Ubuntu 14.04 amd64, and I can confirm that:

- linux-image-3.13.0-27-generic has this bug
- 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14-trusty/linux-image-3.14.0-031400-generic_3.14.0-031400.201403310035_amd64.deb
 does not have this bug.

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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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