Frankly? Make it a warranty issue. If they don't fix it, return it.
I am at my wits end with this issue. I am using an optical connection and my sound keeps switching from 5.1 to 2 channel. Really annoying when gaming.
I have checked all of the settings in my sound options and went through and tested all available supported formats for the a/v receiver and the sound card.
Transport: TOSLINK Optical
Supported format: Dolby Digital
Supported sample rates: 44.1khz, 48.0 kHz, 96.0khz
A/V Receiver: Sony STR-K750p
Direct X 11
I having been building and troubleshooting computers for 16 years and this is making feel like a complete noob. Halp!
I wish I had better news but I'm bumping into really bad drivers and worse support. If I wanted to solve this I might go for a legacy free setup. That is, no analog audio channels.
For example disable all onboard audio and then from the HDMI port run that to the 5.1 receiver and then from that to the HDMI display.
This removes any idea that a driver has an option outside of a HD (HDMI/HDCP) channel.
On some units both on board and sound card outputs have the option of sending the audio via the HDMI. It simplfies the connections. I have had a couple faulty optic cables and a card the optic port was bad. It the problem remains with the HDMI, it points to the sound card dropping the Dolby decode info.
What do the color stripes mean on your tires?
Brian Cooley tells you why you might see various color lines on the wheels of your automobile.