Display port not working after latest W10 update

[paulkinzelman]

I've got an HP Compaq 8000 Elite Ultra-slim Desktop upgraded to W10 long ago.
Display adapter: Intel Q45/Q43 Express Chipset (Microsoft Corp - WDDM 1.1)

I've got it hooked up to my TV (Display Port output -> HDMI input) and it was working fine. I turn on the PC and if nothing is plugged into the VGA port, everything (including the BIOS) displays on the TV.

After the last W10 update, nothing appears on the TV, everything displays on the VGA port.

I tried a "Detect multiple displays" and W10 doesn't detect more than one.
I can't find any settings that look like they would affect this problem.

What did Microsoft break this time?

TIA!

 

[paulkinzelman]

In thinking about it a bit more, because before the update, when the BIOS came out the Display Port (long before Windows boots up), it seems like the problem would be some BIOS setting, but I don't see any setting in the BIOS that would affect the port used for the monitor.