Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: No audio output via DP to HDMI in windows 7. (but it works in Ubuntu)

23 Oct 2013   #1

Windows 7 Professional, 64 bit
No audio output via DP to HDMI in windows 7. (but it works in Ubuntu)


This is the weirdest problem I've ever encountered.

[I use thinkpad x220, Intel HD Graphics 3000, with windows 7 professional 64bit + ubuntu 12.10, in dual mode]

I've recently bought a new Toshiba LCD TV (it has 2 HDMI ports). I've also bought a 15 meter (50ft) HDMI-HDMI cable in order to connect it to my x220.
(I use a DP -> HDMI adapter. I have used it for the last year and a half. It has always worked for me and continues to work - so there's no problem with the adapter. see the explanation in the paragraphs below)

Upon connecting my x220 with the adapter and the 15m cable, I have noticed that while the video connection to the TV is working, the sound doesn't work. Windows doesn't recognize that there's a digital audio device connected to the x220 . It can only play audio from the speakers or headphones port.

Although all drivers are installed:

I wanted to figure out what is causing the problem so I started ruling out things.

I connected another laptop that has an HDMI port with this cable, and it was able to play video+audio to the TV. - so no problem with the cable.

I thought it's a problem with the DP in my x220 or the TV. I tried connecting the x220 with the adapter and a shorter HDMI-HDMI cable (2 meters cable) to the TV, and surprisingly, I got video + audio working:

Now I assumed it's a problem with long vs short cable. But then I booted into Ubuntu with the adapter and the 15m cable and everything worked! The x220 was transferring both video and audio signal on the 15m cable! And I could switch between enabling speakers or digital audio. - so it's not the long cable that is causing the problem.
Ubuntu recognizes an HDMI/DisplayPort audio connection on the long cable:

So I started assuming the problem is with windows 7.
No matter what I've tried (I updated all the drivers, tried checking the sound configuration, searched lots of forums, uninstalled/reinstalled the 'Intel(R) Display Audio' driver), nothing helped.

Can anyone figure this out? What is preventing Windows 7 (as far as I understand it) from transmitting audio on this 15m HDMI cable?

Any suggestion on how to resolve this?


My System SpecsSystem Spec


 No audio output via DP to HDMI in windows 7. (but it works in Ubuntu)

Thread Tools

Similar help and support threads for2: No audio output via DP to HDMI in windows 7. (but it works in Ubuntu)
Thread Forum
Sound works through HDMI output but not internal speakers. Sound & Audio
Realtek HDMI Output ATI HDMI Audio -Not Plugged In- Sound & Audio
HDMI sound output works just fine, audio jacks not at all! New PC Sound & Audio
HDMI output No Audio after Windows 7 install Sound & Audio
Hdmi output works on startup, not windows 7 Graphic Cards

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 08:06 PM.
Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33