*** This bug is a duplicate of bug 1313830 ***
https://bugs.launchpad.net/bugs/1313830
** This bug has been marked a duplicate of bug 1313830
[Lenovo ThinkPad X230] LCD Backlight dims completely when disconnecting
external monitor
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https://bugs.launchpad.net/bugs/1276037
Title:
[Thinkpad T420s] Brightness dims when unplugging external monitor and
cannot be changed afterwards
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