Public bug reported:
Hi,
I have the following problem under Ubuntu 14.04. As soon as I disconnect
my external monitor from my Laptop (Lenovo X1 Carbon), the brigthness is
reduced to minimum (backlight switches off) and I can not increase it
again. When I use the brightness control keys the brightness bar shows
that it is set to maximum even though it clearly is not. Using the
control keys still changes the brightness bar but does nothing to the
brightness itself.
Upon a restart of the laptop the brightness returns to its maximum and
is controllable again.
I encountered this problem under the Unity version shipped with Ubuntu
14.04, but it might happen with other desktop managers as well.
This problem did not exist when my Laptop was running under Ubuntu
13.10.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1307877
Title:
Laptop Monitor Brightness reduced to minimum and disabled after
disconnection from external monitor.
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