Hi Alban,
I have the similar problem, and hope, there will be an easy solution.
If i can help, please let me know. I can send you this dxdiag.txt, but dont know, if it needs the computer to be plugged into the dock, and monitor (i think so). I can not do that at the moment, only a few days later, if it is still ok for you.
Also, i have tried to use hdmi cable, and directly connect the external monitor to the laptop. It worked perfectly, and i could use the secondary graphic driver. I'm not a tech expert, but my bet would be the usb port as the problem source. Maybe the updated win 10 cannot handle the monitor data through the nvidia card, and usb port?
What im using:
Dell Vostro 5470
Dynadock u3.0
Windows 10, version1607
Kind regards,
Kalman
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