The issue is still reproducible with the updated BIOS and I have
discovered another, more severe issue. Steps to reproduce:

1. work with internal and and external monitor connected to dock and both 
switched on and in use. 
2. detach the laptop from the dock physically. Internal monitor stays on, WIFI 
switches on, so undocking is detected by the system.
3. re-attach the open/switched on laptop to the dock. Power button blinks two 
times (signal for detecting the dock). Both monitors stay black and after about 
half a minute the system reboots.

Output of your command:
N10ET44W (1.23 )
07/13/2016

** Changed in: xorg (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1605618

Title:
  Monitor on Lenovo dock not detected after Suspend

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