Upgraded the kernel through the standard channels:
$ uname -a
Linux talas 4.8.0-34-generic #36-Ubuntu SMP Wed Dec 21 17:24:18 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

The original problem seems fixed, it exhibits practically the same behaviour as 
with 4.9.
Docking lights up the monitors, I still have to 'killall unity-settings-daemon' 
to load the configured monitor settings (order and rotation).
I also had X crash to login on two occasions when suspend->dock->resume, but 
this is not reliably reproducible (works most of the time, will report when it 
happens again) and never when docking while awake.

If this is considered as fix released, I shall file a bug with unity-
settings-daemon about the config reload.

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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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