Since upgrading to Windows 10 1803 (released April 2018) I no longer have the center/sub and surround outputs (in the ROG sound manager). I can only output stereo. When you re-plug one of the jacks (center/sub or surround), windows detects it and then reports that it is an unsupported device. I've tried using the latest Realtek drivers and upgrading to the latest bios (released last month) and it still will only see the front left and right and the two inputs (line and mic).
Anyone got any ideas??? I hate to have to use TOS-link for audio.
Looks like this with missing ports.

Should look like this.