I had the same problem with a Suirface 3 Pro i5
I have attached my log from when I had 7.7 installed.
7.7 Blank screen, 7.6m2 screen worked
Also, when I uninstalled 7.7 and installed 7.6m2, my wifi stopped working properly. It would connect to the router but not connect to the internet.
I uninstalled 7.6m2 and now the internet connection worked.
So at this point I can not use my external monitor.
I have both the Diamond DS3900 and MDS3900 And it was the same with both.
I really need this to work again....
Thank you guys
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