I was experiencing the same issue with a ThinkPad 25 (which is almost the same thing as T470) and I implemented these precautions as a workaround:
- disable DPMS when docked and external monitors enabled - never switch VTs with external monitors enabled - always disable external monitors before suspending or undocking Posting here just in case someone is still suffering from this and hasn't figured out a workaround yet. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1727662 Title: [Lenovo ThinkPad T450s] Issues after docking and locking To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1727662/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
