This seems to be a regression, that had happened not long ago. Currently I am experiencing this bug with 3.13.0-44-generic (backported to Ubuntu 12.04) on a T420s. It applies to the VGA port too.
However, I used external displays from time to time, and do not experience this bug about two month ago. So for me, it appears to be added by the last two moths. However, the backported kernels may be a little delayed, so others may experience this bug earlier this year. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1313830 Title: [Lenovo ThinkPad X230] LCD Backlight dims completely when disconnecting external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1313830/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
