Nvidia C561 Video Card Problem

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This card has DVI and HDMI connections.  My Gigabyte GA-MA785GM-US2H
mobo has both on-board too.  I want to connect HDMI from PC to TV.  I
need to have HDMI show up as default under sound Playback Devices,
which it does not now do.

I must have the wrong drivers for this card because I don't see HDMI.
Further, even though I set the BIOS for on-board HDMI,  don't see HDMI
either.  Should life be this difficult?

I am using W7 Home Premium SP1.



Re: Nvidia C561 Video Card Problem

Piper@here.net wrote:
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There are three generations of HDMI hardware.

1) Original HDMI on video card device. No Audio capability at all.
    This is the situation on older equipment.

2) Next generation after that, the video card has a two contact connector
    at the top of the video card. You run a special cable from a motherboard
    S/PDIF connector to the top of the video card. This is HDMI audio passthru.
    It takes digital sound from the motherboard audio and pipes it through
    the GPU. While this was going on, it allowed NVidia to work on a
    real live HDaudio interface on the card.

    The number of audio channels would be strictly limited in this case,
    as would the sample rate and resolution. S/PDIF is "only" 6Mbit/sec
    and for the most part, carries stereo. So you could think of it as
    2 channel LPCM. I don't know what would happen if you set the S/PDIF
    for AC3 compressed 5.1, whether a TV or home theater system would
    understand that or not.

    In any case, the documentation for this is limited, so the odds
    any percentage of users got to try this, is pretty low.

    ATI did not participate in this generation. ATI went from (1) to (3).

3) True audio over HDMI. This is a digital blob on the video card,
    presumably at a video card bus decode, that generates 8 channel LPCM
    for passage over the HDMI cable. You must install a video driver
    package that includes GPU driver, as well as Audio over HDMI HDAudio
    driver. Some products keep these two drivers separate. For a desktop
    video card, where you get the driver from the NVidia site, I would
    expect the audio driver to be inside the same download as the GPU
    video update.

    In the case of ATI (3), for the first year or so, the drivers were
    branded "RealTek", even though the video card is "ATI GPU". Eventually,
    ATI got their own branding on the driver. I expect they slipped RealTek
    a few bucks, to get an HDAudio driver until they could write their own.


Regarding 785G...


Re: Nvidia C561 Video Card Problem

Paul wrote:
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(Stupid newsreader decides to post on me...)

Regarding 785G...


    "AMD's 780G/790GX have been limited to two-channel LPCM over HDMI."

    "In fact, AMD says the chipset's audio block has not changed at
     all since the 780G."

So there is some possibility it has sound, with the right driver.
And that description almost makes it seem like they're using an
HDAudio S/PDIF or something, to create the output samples.

The chipset has the limitation, it cannot drive the HDMI and DVI digital
interface at the same time with dual-head signals. Only one connector
of those two should be connected up. I don't know how that would
affect what is stated in the BIOS. Whether there is a selector
for that or not.


I have no idea what a C561 is.

You will need to find some other sort of identifier if you can.
If you need inspiration, older cards are listed here. The site owner
no longer updates it.

(Possible card names are on the left column)



Re: Nvidia C561 Video Card Problem

On 2015-06-29 6:48 AM, Paul wrote:

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Here is a list of User Agents ordered by popularity:


Thunderbird runs on Windows etc. 11390 articles 881 posters.

Ratcatcher/ (Windows/20130802) 3 articles 1 poster. ;)

Re: Nvidia C561 Video Card Problem

On Mon, 29 Jun 2015 07:31:01 -0400, Piper@here.net wrote:

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The whole thing seems messed up anyway.  As I said, the mobo has
on-board DVI and HDMI, and the BIOS can be set to one or the other BUT
NOT BOTH. or  a third choice, called 'default'.  What I find is that I
cannot drive a display image to the monitor from the on-board DVI
connection no matter what I set the BIOS to.  The only way I can get a
monitor display is by connecting its DVI to the video card's DVI

Also, I can get no normal audio at all yet from the mobo.  Device
Manager shows no driver problems that I see.

Whether the HDMI connection will provide video/sound from either
connection, I dunno.  I have not tried it yet - but the sound
'playback devices' only shows these two:

Speakers  (said to be 'default')
Realtek High Definition Audio


Realtek Digitial Output (said to be 'Ready')
also Realtek High Definition Audio

so maybe it will.

I am desparate now because my prior laptop effort has gone where the
wild goose went - the laptop is now defunct.


Re: Nvidia C561 Video Card Problem

Piper@here.net wrote:
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These two come from the same chip.

    Speakers  (said to be 'default')
    Realtek High Definition Audio                <--- Analog audio


    Realtek Digitial Output (said to be 'Ready') <--- S/PDIF digital 6Mbit/sec

The S/PDIF can be provided three different ways. It is available
on a 1x4 header (for usage with an adapter card, not provided).

S/PDIF can be routed to a coaxial cable port
(about 1V amplitude, suitable for stereo receiver)

S/PDIF can be routed as a TOSLink red LED fiber optic
port (available on some stereo receivers). My latest
motherboard has both coax and optical, but I don't
own any home theater equipment that uses it.

So that's all the result of motherboard RealTek chip audio
functions. And one driver put that there.


If the 785G has audio to offer, it will be limited to
stereo. Which is fine for a lot of HDMI TV sets.

You need to check the website here for drivers
for the 785G.


There is "Automatically Detect and Install Your Driver",
but some of those schemes can have onerous requirements
(like running Java, or some version of .NET you don't
happen to have). But it will point you at some drivers.

The driver you get, will be huge (hundreds of megabytes),
and with any luck, with have an audio driver folder. See
if a new audio item shows up after it is installed.

I'm just going by the comments in the Tomshardware web page,
that this is going to work.

To some extent, video connectors are all set up with
"jack detection" features. When the video card driver is
installed, each video connector can do cable impedance
sensing. On HDMI, the 100 ohm differential termination
provided by the TV set, that can be sensed at the driving
end, and then "the computer knows a monitor is connected".
That's the basic idea. The BIOS setting on the other hand,
helps control where the BIOS text messages go at startup.
So depending on how the BIOS is set, you may not be able
to view the BIOS text on the TV set.


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