I'm getting the same error on a Thinkpad Yoga S1 when I connect to a dock. I've only started experiencing this as a major problem since upgrading to 16.04. I'm on the latest BIOS for this device (1.28).
** Bug watch added: Red Hat Bugzilla #1321296 https://bugzilla.redhat.com/show_bug.cgi?id=1321296 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1552040 Title: Laptop sometimes doesn't detect external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1552040/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp