No audio through displayport

[NoOp]

On 10/22/17 7:49 PM, MR ZenWiz wrote:
> I have an HP 8740w "elitebook" laptop that comes with a displayport
> instead of an HDMI port.
> 
> I have tried every possible combination of DP->HDMI adapter and nvidia
> vs nouveau drivers and none of these combinations produces an audio
> stream that goes through the digital interface the DP (and HDMI) are
> supposed to provide.
> 
> All I see in the volume control audio settings are five analog stereo
> settings and an off setting.  None of these produce sound through the
> DP->HDMI cable, and one of them shuts off the sound through the
> headset plug, though it does brighten the sound through the built-in
> speakers.
> 
> I have complained to nvidia, and their response was essentially, well,
> that's an old viddeo card, tough luck.
> 
> I did a search for "laptop hdmi plug-in video controller" and nothing
> turned up in the way of cards, just troubleshooting tips, mostly for
> Windows, which I have already seen.
> 
> Is there such a thing at all and who sells them?
> 
> Is there another option and if so what?
> 
> I really like this laptop, but I'll sell it and get another if this
> isn't possible.  Too much of a shortfall.
> 
> Thanks.
> MR
> 

Perhaps kernel related?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1457369
[kernel 3.19.0-18 breaks HDMI audio for snd_hda_intel ]
Note comment 69 & see if that is worth trying:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1457369/comments/69
"date from prior message: I fixed sound, using Pulseaudio. I had to
"apt-get install pavucontrol", and then issue "alsa -force-reload". But
now, sound works with vmlinuz-3.19.0-22-generic. Thanks everyone!"

Maybe try the HP converter cable:
http://www8.hp.com/us/en/products/oas/product-detail.html?oid=7353776#!tab=features