https://bugzilla.novell.com/show_bug.cgi?id=853464 https://bugzilla.novell.com/show_bug.cgi?id=853464#c0 Summary: Thinkpad t440s in Ultra Dock with external monitors attached will hang Classification: openSUSE Product: openSUSE 13.1 Version: Final Platform: x86-64 OS/Version: openSUSE 13.1 Status: NEW Severity: Critical Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: eric@intellovations.com QAContact: qa-bugs@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36 I have a Thinkpad t440s and Ultra Dock. If I boot attached to the dock and there is an external monitor attached, it will hang/freeze after the boot screen. If I remove it from the dock, it will continue booting normally. If I attach the laptop to the dock while running, it will freeze or sometimes continue running normally on the laptop screen, until I select Configure Desktop->Display and Monitor, at which time it will hang. Again, removing from the dock will unhang it and it will start working normally. If I attach the laptop to the dock when the dock does not have any external monitors attached it works fine. If I try to attach a monitor, the system hangs until the laptop is removed from the dock. This problem is also exhibited on Fedora 19 (https://bugzilla.redhat.com/show_bug.cgi?id=1036974) and Fedora 20 (https://bugzilla.redhat.com/show_bug.cgi?id=1035448). So it is not distro-specific. There is nothing notable in either /var/log/messages or /var/log/Xorg.0.log, certainly no error messages. It is like the system just freezes. I have waited up to 5 minutes with no change. The hardware/graphics specific are: Intel Core i7-4600U 2.10GHz (haswell) Intel Haswell-ULT Integrated Graphics ThinkPad t440s w/FHD (1920x1080 display) ThinkPad Ultra Dock (40A20090US) External Dell 2408WFP monitor at 1920x1200 resolution I would be more than happy to troubleshoot or run debugs, etc. Reproducible: Always Steps to Reproduce: 1a. Attach unpowered laptop to dock that has external monitor attached. Boot. or 1b. Attach running laptop to dock that has external monitor attached. If it doesn't freeze immediately, run Configure Desktop->Display and Monitor to set up external monitor. Will freeze then. Actual Results: System freezes. Expected Results: System continues to run and displays output on external monitor. I am more than happy to tear apart the system, run debugs, etc. This currently is not a critical system. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.