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Windows 7: SPDIF disables itself overnight

11 Sep 2012   #1

Windows 7 Ultimate x64
SPDIF disables itself overnight

SPDIF used to work flawlessly with WMC7 and Intel G620 integrated graphics. I only needed to set the SPDIF as default in the Via HD panel.

Since installing an HD 6450 video card I have to re-select this option everyday, or more if the HTPC stays in sleep mode for a long time. In fact the HTPC is always on & just goes to sleep when not used.

The other day I found an SPDIF setting in Control Panel > Sound and made it the default, but that made no difference.

Any suggestions on how to fix this?

My System SpecsSystem Spec

11 Sep 2012   #2

Windows 7, 64 bit Home SP1, Win 8.1.1 Pro 64 bit

Are you using S/PDIF from the motherboard's integrated audio or does the HD6450 provide S/PDIF? The video card should not make a difference unless it has HDMI on it and you have an HDMI cable connected.

Also, are you using the correct sound drivers? The drivers from the motherboard vendor are the preferred drivers. Other drivers such as the generic Windows installed HD Audio Codec does not always work or work properly.
My System SpecsSystem Spec
11 Sep 2012   #3

Windows 7 Ultimate x64

The SPDIF is coming off a header on the mobo. The HD6450 has no SPDIF. I need SPDIF because my A/V receiver does not have HDMI inputs.

HDMI used to come off the mobo port & went to the HDTV. Now I'm using HDMI from the HD6450 to the HDTV.

The mobo is using the manufacturer's driver from their disc.
The HD6450 is using the latest driver from it's manufacturer's web site.

So it's SPDIF from the mobo & HDMI from the HD6450. I thought that might be an issue but it does work. It just does not "stick". This afternoon I turned on the PC & SPDIF was still enabled which surprised me. I thought maybe the order in which I tried & selected things might have made a difference. But then I turned of the PC & when it came back on the SPDIF was disabled in the Catalyst Control Center.
My System SpecsSystem Spec

11 Sep 2012   #4

Windows 7, 64 bit Home SP1, Win 8.1.1 Pro 64 bit

It has something to do with the HDMI cable being connected to video card. Usually, Windows will default to that if an HDMI cable is attached to the video card. As you can only have one default audio playback device the S/PDIF will (or usually will) get overriden by the HDMI.

If you can get both working at the same time, that is not the usual way Win 7 works.
My System SpecsSystem Spec
11 Sep 2012   #5

Windows 7 Ultimate x64

I'll see if there's a new sound driver for the mobo.
My System SpecsSystem Spec
15 Sep 2012   #6

Windows 7 Ultimate x64

I've disabled the HD 6450 card's audio in the device manager.
I've confirmed with ECS that onboard video is automatically disabled when a graphic card is inserted into the mobo.
I've installed the latest sound driver from the ECS website.

SPDIF still gets disabled as the default setting in the Via HD audio deck after long periods of sleep, such as overnight.

Any suggestions?

Is there any registry hack that will keep SPDIF as the default?
My System SpecsSystem Spec

 SPDIF disables itself overnight

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