With kernel 3.17.0-031700-generic: - 1st time I plugged in the DisplayPort connector, nothing happened (bug 1263681). I pressed Fn-Home as a workaround and external monitor got detected, but internal monitor went black (no picture, no backlight). Pressing Fn-Home again turned it on, at minimum brightness. Fn-Home/End brightness control keys continue to work.
- 1st unplug changed nothing - 2nd hotplug was detected instantly, internal LCD went black again. Fn-Home was required again to bring it to life. - 2nd unplug changed nothing - 3rd hotplug was same as 2nd. I can bring the internal LCD into the no-picture-no-backlight state by pressing Fn-End until I reach minimum brigthness. This is something new: with older kernel versions minimum brightness still had a visible picture. Conclusion: latest kernel has one half of the bug (DP hotplugging drops screen brightness to minimum level) but so far hasn't shown the other half (brightness keys don't stop working). ** Tags added: kernel-bug-exists-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1378863 Title: ThinkPad X220: unplugging DisplayPort breaks backlight (intel video) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1378863/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
