I am also experiencing this problem with a Lenovo T440s.

Linux quickstone 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1313830

Title:
  [Lenovo ThinkPad X230] LCD Backlight dims completely when
  disconnecting external monitor

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