Hi there. There seems to be a problem with using a 2nd screen via dock on the Thinkpad T440s. I have the version with Intel HD4400 only, but users with additional dedicated graphics also report this (though Intel seems to be the cause). Steps to reproduce: 1) Power off Thinkpad T440s, connect 2nd screen to dock, put Thinkpad into dock. 2) Boot Thinkpad: both screens stay black. or 1) Power on Thinkpad, leave it on and connect 2nd screen to dock 2) Put Thinkpad into dock - the system freezes, 2nd screen shows no image. In both cases the system can be unfrozen by undocking. Connecting a 2nd screen directly to the Thinkpad works as intended. Apparently more users start to experience this problem: https://bbs.archlinux.org/viewtopic.php?id=173134 I am completely new to reporting kernel bugs but am eager to help solving this problem. Let me know how I can help. ;)
I can confirm this. Meanwhile, over at fdo, people seem to be working on the issue: https://bugs.freedesktop.org/show_bug.cgi?id=71267
(In reply to kepler from comment #1) > I can confirm this. Meanwhile, over at fdo, people seem to be working on the > issue: > > https://bugs.freedesktop.org/show_bug.cgi?id=71267 Yeah, let's track this there. Please reopen if you think this is a different issue.