NVIDIA: no sound to TV via HDMI

[Dennis Gilmore]

On Monday 25 January 2010 03:04:49 pm Marcel Rieux wrote:
> On Mon, Jan 25, 2010 at 4:30 AM, Ed Greshko <Ed.Greshko at greshko.com> wrote:
> > Bill Davidsen wrote:
> >> Marcel Rieux wrote:
> >>> Since the NVIDIA forums are just a lost of time, I'll first ask the
> >>> question here.
> >>> 
> >>> I have an NVIDIA 9400GT card and a Sony LCD TV linked with an HDMI
> >>> cable.
> >>> 
> >>> First problem I found: the S/PDIF cable -- which is needed only with
> >>> NVIDIA cards -- wasn't installed. The plug had a molding problem and
> >>> one of the 4 holes was blocked. (The hole was just empty: no wire
> >>> going to it.) I opened it with a pin, installed it with the arrow
> >>> facing the closest part of the motherboard, reversed it, and, of
> >>> course, sound doesn't come out of the TV. It's an Nvidia product!
> >>> 
> >>> Anybody got this working?
> >> 
> >> Did you get PulseAudio to send output to the connector? Many times this
> >> is a PA config issue.
> > 
> > That is actually a very good question....
> > 
> > Everything I would find out about ASUS Nvidia 9400GT based cards
> > (assuming this is an actual card) is that the spdif cable is simply a
> > pass though.  One connects the spdif cable from the graphics card to
> > either a sound card connector or motherboard connector (depending on
> > your system and its configuration) and sound is simply passed through to
> > the HDMI.
> 
> That's how it's *supposed* to work.
Ive never heard of such a config for hdmi.  My myth box does hdmi out  i plug a 
hdmi cable from the computer to the tv. audio and video both go over the same 
cable. Selecting the right profile in pulse audio activated things correctly.  
i get sound though my tv.  due to the way hdmi works you do not get volume 
control on your computer.  it passes a constant signal  which the end device 
uses to control volume.  likely the device is muted by default.

> > So, one needs to ensure the output is configured correctly.
> 
> The only relevant configuration I see for sound is under the hardware
> tab. Anything analog gives an output on the computer, anything digital
> gives no output. In both cases, there is no output on the TV.

Dennis
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