The problem was fixed just by rebooting so it seems this is a kernel bug that left the driver hedged in an unrecoverable state.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1637754 Title: No image out of display port in Lenovo T460s To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1637754/+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