Good news!

~$ uname -a
Linux talas 4.9.0-040900-generic #201612111631 SMP Sun Dec 11 21:33:00 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

Undocking and docking repeatedly works for me. None of the logs shows i915 
errors.
I do have to killall unity-settings daemon at every docking to reload the 
monitors.xml configuration (rotation and turning off the laptop screen), but 
that's quite preferable to rebooting the system (and by now a hotkey).

A related question: I do need both the nvidia module (for primusrun) and
vboxdrv for work. Any reasonably comfortable method to load them with
mainline 4.9? Don't want to be stuck with rebooting until 17.04.

** Tags added: kernel-fixed-upstream-4.9

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https://bugs.launchpad.net/bugs/1651454

Title:
  [Lenovo Thinkpad T460p] Ultra Dock external displays not detected
  after suspend/resume cycle

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