I have an Alpha R2 that where I'm feeding the video and audio through an HDMI cable to a receiver. Usually there is a "Speaker Fill" enhancement that can be utilized to use all surround speakers even if the computer is playing stereo audio (like a music CD, or youtube videos). This enhancement doesn't exist for my nvidia hdmi audio out though. Does anyone know if there are drivers or something that can be updated to get this enhancement option?
You don’t mention the make/model of the AVR, But you normally make digital audio processing settings like that on the AVR itself .
Most will allow a 2-channel file to “matrix out” to your systems 6.1 or whatever speakers you have. Try Dolby PLIIx-Music or similar.
You can also try “all channel stereo”.
Files instead encoded with digital-bitstream audio (DD5.1, DTS, etc.) play a little differently (vs. these with simpler PCM audio ).
Realtek enhancements require the OEM driver and use of analog audio.
Windows 10 feature updates routinely break this requiring removal and reinstall of the OEM driver.