I have a W540 that also freezes when trying to use DP, with the difference that I don't see any oops or error message in neither the kernel logs, nor the X logs. When I plug in an external monitor, xranrd shows it as connected to DP2, regardless of whether it's connected to DP1, DP2, DVI or HDMI. On one occasion, I have been able to get a mirror output on both DP1 and DP2 (still after 1-2 min of freezing), even though xrandr still showed only DP2 as being connected. I have been unable to reproduce that partial success since. During the freeze, Xorg keeps using a steady 20% CPU, but any attempt at attaching gdb to the Xorg process only resulted in gdb feezing (had to kill -9 it). Anything I can run to help debugging this?
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1275794 Title: Lenovo T440s freezes when connected to docking station To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1275794/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
