I just had to install the latest (beta) HD Graphics Drivers because when my SB wakes from sleep, it is consistently losing 2 of the 3 external monitors. Moreover, I was still experiencing a blank SB screen from time-to-time, forcing me to power off and then on again.
For the longest while, prior this new update, as long as it woke from sleep, all my 3 external monitors were still preserved 99% of the time.
I installed the Beta 15.40.18.4380 version.I have exactly the same issues with external monitors not coming back after resuming.
Also look here:
External monitor not getting signal from Surface Dock when resuming from sleep.
Did you get it work with the latest intel beta-driver even after the Microsoft Update?
Which version do you exactly use?
Same here.I'm not sure but it looks like Surface UEFI update (v104.1085.768.0) is pulled out. I installed all updates and it says my system is up to date, however my System UEFI is 88.1085.768.