Hi Paul,

To fix this, open the Control Panel and click on Sound. On the playback tab, you should see more than one device. If not, right-click in the white space and choose Show Disabled Devices. Hopefully you’re TV or at least HDMI speakers will appear in the list and you can select them instead of the computer.

Ravi

I have tried this, but I only have one playback device, and the options for disabled and disconnected devices are both ticked.

I have some more information from my testing here....

The on-screen button options for controlling volume only appear when the HDMI input is selected; they are not present when the Computer display is selected. This would suggest to me that the HDMI audio input is supposed to work.

I've also confirmed that the audio output from the PC is disconnected from the internal speakers when the HDMI input is selected; again suggesting that the HDMI audio is intended to work.

I look forward to your confirmation of the behaviour of your test device to know if there is a further problem with my device.

Thanks, Paul

Hi Paul,

Sorry for the confusion. When you are using HDMI input on the Dell XPS One 2720. The system is acting like monitor. Please check if the source you are connecting is transmitting audio by connecting the source to other external display.

Please let us know the details of the external video source you are connecting.

The SKY+ definitely transmits Audio via HDMI - if I use the same Sky box and HDMI cable into my TV, the audio is sent to the TV (along with the video). I have also tested this with an HDMI output from my Acer laptop. Into the TV I get audio and video (and the speaker icon in the taskbar on the laptop shows the 'Samsung' audio device (the TV)). When I plug the same laptop into the HDMI IN on the XPS 2720 I get video but no audio. The Speaker icon on the laptop shows 'XPS 2720 (Intel(R) Display Audio)' and is set to 100 (full volume). Changing the volume on the laptop or the On Screen controls on the XPS make no difference. I think that this final test proves that the XPS 2720 should be playing audio from an HDMI source.

HI Paul,

It seems like an issue with the XPX 2720. I would suggest you to update the BIOS on it.
Please enter your service tag # on the link below, select the OS, then download the BIOS from BIOS section onto the system and install it.

http://dell.to/18r60nI

Please let me know if this helps."

Thanks

I have a support call open, and hope to have an engineer visit next week to look at this

Hi Paul,

Please reach out to us if you have any other queries.

Was this issue solved?  I am having the exact same problem.  HDMI worked before.  After Windows 10 Anniversary Update my system crashed and I had to completely reinstall Windows 10 from boot disk and reinstall all hardware.  I've updated all drivers etc but now HDMI does work like before. Onscreen volume buttons say volume is 0 but sound is maxed and can not be adjusted.

Yes it was solved (eventually!) - they changed the motherboard and the USB/HDMI board - but this didn't resolve the issue.

Then the DELL engineer looked into the drivers, and found a large number (5 or 6 I think) of 'WAN Miniport' drivers installed.

(I hadn't installed these - they must have been default from Windows installation).

He removed these (saying they weren't needed), and then rebooted, and the HDMI audio started working....

I cannot explain logically why this resolved the problem, but it did and I hope it helps you....

Paul

I have a unit I got last December with Win 10 pre-installed and running most recent version.

The sound sounds fine on it with no modifications.  I am using an Inspiron 17 to watch a movie on the 2720 for testing.

The situation with the speakers and headset playing is related to a mixer utility which should show as Dell Audio in the hidden icons on the taskbar.