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Old November 10, 2014, 08:37 AM
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Default LGA 1155 mobos audio question

I am looking to get a cheap LGA 1155 system and my main question is : in the absence of an HDMI port, will the DVI connector transmit the sound too, to get it to the TV over an DVI to HDMI cable?
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Old November 10, 2014, 09:03 AM
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I've never heard of a DVI connector that transferred Audio.

DVI connectors transfer video signals and can be analog or digital (or both).

You will have to do one of two things:

a. If the motherboard has a good audio output like SPDIF and you can plug that into your TV, then that might transfer the audio over. It depends on the TV, though: some TVs will only accept a separate audio signal if you put the TV in "PC" mode - in HDMI mode they expect the audio to be in the HDMI connector with the video signal.

b. Find an adapter that takes audio from your computer and "adds it" to the HDMI cable.

[Edit] You may find it cheaper to buy an inexpensive ATI/AMD video card that includes an HDMI audio driver and you connect it directly to the TV with HDMI.
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Old November 10, 2014, 09:10 AM
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Quote:
Originally Posted by MAK View Post
I've never heard of a DVI connector that transferred Audio.

DVI connectors transfer video signals and can be analog or digital (or both).

You will have to do one of two things:

a. If the motherboard has a good audio output like SPDIF and you can plug that into your TV, then that might transfer the audio over. It depends on the TV, though: some TVs will only accept a separate audio signal if you put the TV in "PC" mode - in HDMI mode they expect the audio to be in the HDMI connector with the video signal.

b. Find an adapter that takes audio from your computer and "adds it" to the HDMI cable.

[Edit] You may find it cheaper to buy an inexpensive ATI/AMD video card that includes an HDMI audio driver and you connect it directly to the TV with HDMI.
I'm pretty sure the early AMD DVI-HDMI adapters would transfer audio prior to HDMI ports being standard on vid cards.

As far as the original question goes... wish I had a board on hand to test for you.
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Old November 10, 2014, 09:53 AM
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As stated above it is possible, but I have no idea if anything current does it.
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Old November 10, 2014, 10:08 AM
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This is onboard right?

Not sure how much help it will be but I'll be playing with this Intel® Quad-Core Processor J1900 board over the next few days so at the very least I'll be able to verify if new(ish) intel HD onboard can do it.
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Old November 11, 2014, 12:20 PM
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Quote:
Originally Posted by MAK View Post
I've never heard of a DVI connector that transferred Audio.
I had that function working on AMD cards since radeon hd 2600 xt. GTX 400 cards and newer do that too!
Yes, I am talking onboard.
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Old November 12, 2014, 10:20 AM
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Ok, like I said, not sure if the information is useful to you at all, but I just confirmed that a J1900 board ( ASRock > Q1900M ) outputs audio over a DVI - HDMI cable. Just a guess on my part, but based on the fact that this is a relatively new(ish) platform with onboard intel video I'd be inclined to suspect that it's still the standard.
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Old November 12, 2014, 11:14 AM
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It's explained here:

http://en.wikipedia.org/wiki/Digital..._compatibility

Audio isn't at all part of the DVI spec, but because HDMI is so similar, a device can be designed to output HDMI audio from a DVI source to an HDMI connector.

Quote:
To promote interoperability between DVI-D and HDMI devices, HDMI source components and displays support DVI-D signalling. For example, a 1080p HDMI display can be driven by a single-link DVI-D source - since HDMI and DVI-D both define an overlapping minimum set of supported resolutions and frame buffer formats. So, DVI-D devices output HDMI signals, many including audio, (examples: ATI 3000-series and NVIDIA GTX 200-series video cards),[9] and some multimedia displays input that HDMI signal, including audio, by using a DVI to HDMI adapter. Exact capabilities vary by video card specifications.
I did some quick Google research, and DVI audio support for Intel integrated graphics seems hit and miss. One theory is the function is supported by the IGP but may be broken by the implementation.

Last edited by Desiato; November 12, 2014 at 11:24 AM.
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Old November 12, 2014, 01:17 PM
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Quote:
Originally Posted by MARSTG View Post
I am looking to get a cheap LGA 1155 system and my main question is : in the absence of an HDMI port, will the DVI connector transmit the sound too, to get it to the TV over an DVI to HDMI cable?
It works sometimes. You need to turn it on in the BIOS and in the Intel Control Panel on iGPU or in the Nvidia Control Panel.

Also check on Amazon if people mention this function in their reviews. Only some adapters work for some reason.
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