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Audio keeps switching from 5.1 to 2 channel.

by jhughes808 / March 6, 2014 2:34 AM PST

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.

Soundcard: Realtek
Codec: ALC892
Transport: TOSLINK Optical
Supported format: Dolby Digital
Supported sample rates: 44.1khz, 48.0 kHz, 96.0khz

A/V Receiver: Sony STR-K750p

PC Specs:
i5 3750k
16384MB DDR3
Direct X 11

I having been building and troubleshooting computers for 16 years and this is making feel like a complete noob. Halp!

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All Answers

Best Answer chosen by jhughes808

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Thank you!
by jhughes808 / March 6, 2014 2:46 AM PST
In reply to: It's a real problem.

Seriously this had me so frazzled my google-fu was completely breaking down as my neurons were dying. Knowing I am not alone eases the pain. Time for a new sound card, I am glad that it's not a receiver issue.

Thank you so much for your turbo-speed assistance.

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Just a thought.
by R. Proffitt Forum moderator / March 6, 2014 3:05 AM PST
In reply to: Thank you!

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.

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Some sound cards have the option
by mjd420nova / March 6, 2014 3:21 AM PST

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.

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