[mythtv-users] Frustrating HDMI Issue

[Jean-Yves Avenard]

On 7 April 2014 06:48, William Lewis <minutemaidpark at hotmail.com> wrote:
> Thanks in advance for anyone who can help.
>
> I think my issue is some kind of HDMI sync issue between my Linux box and my
> Denon AVR-1913, but I don't have the knowledge to prove it or fix it.
>
> My setup is an AMD HD 6450 with the DVI output going to my LG HDTV and the
> HDMI output going to the Denon receiver, which is then connected by HDMI to
> the same TV.  On the DVI output, everything works swimmingly, but there's
> obviously no audio over the DVI to HDMI connection.  I had a GeForce GT210
> previously, and I had these exact same symptoms.

there's no reason there can't be sound with DVI these days, especially
as usually when a video card has DVI and hdmi output it's the exact
same electrical signal coming out.

If you use a DVI input on the TV, it's likely they disabled sound.

DVI == HDMI electrically, it's just a different connector.

>
> The receiver just refuses to go into digital mode, accepting no commands
> from the HTPC.  But xrandr reports a list of valid modes, with 1920x1080 at 60
> Hz being selected, and it says it's connected properly.  There is no output
> on the TV, however, except for a Denon splash screen.  So I tried bypassing
> the receiver altogether and going straight to the TV.  This worked, but the
> TV did not detect a valid signal, I guess.  The input was gray.  I selected
> it anyway, and I got my Mythfrontend.
>
> So I guess the problem is between the receiver and the PC, probably the PC.
> How do I fix it, and what info could I give to help determine what's wrong?
> It looks like some kind of handshake issue with HDMI, but I don't know what
> tools to use to prove it.
>

What happen when you connect the DVI output (that you know work), to
the amp using a DVI->HDMI adapter?

Then try the same setup, but using the same input on the TV that you
know work (but didn't give you sound) (need another hdmi->dvi adapter
again)

do you get signal on the TV then?

Also try connecting your PC via the same hdmi cable to the TV

Try to do so, so at least you'll be able to identify where the problem
lies: the video card, the amp or the TV.

could be your cable also...

BTW, you're better of using the nvidia card over the ATI... it
supports more thing.