If you have onboard Realtek HD sound, and you’ve updated to Win 10 — even if you’re using the unlocked drivers — you will notice that it is no longer able to play anything in Dolby Digital Live or DTS Connect. The options are still available, but testing them produces a “Failed to play test tone” error message, and switching to DD or DTS through optical out (or any form of output) gives you dead silence when trying to play a file, or a “This device does not support the selected format” error message.
THIS IS A KNOWN BUG. It is *not* your drivers. Don’t go crazy uninstalling and reinstalling drivers. The fix is at least more than three weeks out, unfortunately, even for those in the Windows Insider program. It is being worked on, however. You can find the thread for it right here:
Currently my workaround is to send HDMI out to my TV through my graphics card (nVidia GeForce 980Ti), then Toslink from the TV to receiver, and this way I can at least get AC3 (Dolby Digital) to work; unfortunately, I can’t get it to work in VLC Player, only in the supplied Windows 10 “Movies and TV” app. It’s annoying, but I’m not shelling out money for a new sound card when it’s a known bug being worked out that will eventually get resolved.
Good luck to all of you having the same problem.