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Old 07-21-10, 06:42 AM   #1
admered1
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Default Which chipsets support Linux Audio over HDMI

My intent is to build as minimal a box as possible; to feed into an HDMI receiver and run MythTV.

Key to this requirement is not having extra cards and being able to fully control the sound stage. I am currently using a separate sound card equipped with an SPDIF output, combined with the DVI-D output from the nVidia Corporation G86 [GeForce 8500 GT] (rev a1) card. This gets me most of the way, but SPDIF only supports 2 PCM channels, whereas HDMI supports 6 and can therefore do full 5.1 surround into the receiver without having to use lossy compression and run foul of proprietary issues with DTS etc.

The question is, I hope, quite simple. When choosing the next video card, which chipsets should I be selecting from. Which chipsets properly support the ALSA:hdmi device and will place full 5.1 digital sound on the HDMI audio channel.

Ideally the card will have no VGA or DVI-D output, only an HDMI and will display everything from the BIOS startup to the final 1080p Xorg image on the HDMI connected TV screen.

Thanks
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Old 07-21-10, 07:28 AM   #2
cehoyos
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Default Re: Which chipsets support Linux Audio over HDMI

The G210 I use does everything you want and is passively cooled (but also has VGA and DVI output).

Carl Eugen

PS: HDMI supports up to eight channels.
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Old 07-21-10, 09:40 AM   #3
admered1
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Default Re: Which chipsets support Linux Audio over HDMI

Quote:
Originally Posted by cehoyos View Post
The G210 I use does everything you want and is passively cooled (but also has VGA and DVI output).
Well at least something does actually do ALSA:hdmi. This is the first positive confirmation I have seen. Elsewhere I see bland statements to the effect "Linux does not do audio over HDMI" .. all in, all done.

Quote:
Originally Posted by cehoyos View Post
PS: HDMI supports up to eight channels.
Sorry, my mistake.

Just as a matter of interest, if you fire up something like speaker-test or aplay, can you demand all 8 channels of audio? And if you do so do you get sound from all 8 attached speakers? With spdif you can only demand 2.

Thanks for getting back to me so quick.

Andy M
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Old 07-21-10, 10:17 AM   #4
cehoyos
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Default Re: Which chipsets support Linux Audio over HDMI

Quote:
Originally Posted by admered1 View Post
Well at least something does actually do ALSA:hdmi. This is the first positive confirmation I have seen. Elsewhere I see bland statements to the effect "Linux does not do audio over HDMI" .. all in, all done.
They mean that they haven't yet succeeded in getting TrueHD and DTS-HD over HDMI.
Quote:
Just as a matter of interest, if you fire up something like speaker-test or aplay, can you demand all 8 channels of audio?
Yes: http://www.nvnews.net/vbulletin/show...12#post2260112
Quote:
And if you do so do you get sound from all 8 attached speakers?
No, because I only have six speakers attached;-)

Carl Eugen

Last edited by cehoyos; 07-23-10 at 04:52 AM. Reason: Link to my original post about HDMI connection added (and improved).
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Old 07-21-10, 12:03 PM   #5
ScottKnight
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Default Re: Which chipsets support Linux Audio over HDMI

All of my systems work over HDMI:
Asus P5N7a-VM (GeForce 9300)
Gigabyte GA-E7AUM-DS2H (GeForce 9400)
Zotac MAG (ION)
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Old 07-23-10, 04:20 AM   #6
admered1
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Default Re: Which chipsets support Linux Audio over HDMI

Thanks for your feedback folks. Trouble is, now I've got my shopping head on :-)
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