X220 Displayport audio not working on Windows 7, but works on Linux

[axur-delmeria]

I have an X220 dual-booting Windows 7 Professional 64-bit and Debian 8 64-bit.

I have an LCD TV connected using a Displayport to DVI-D adapter, a DVI-D to HDMI adapter, and an HDMI cable.

For some reason, audio cannot be routed to the TV when under Windows, while it works with no issues on Linux.

I'm using the 83d640ww graphics driver from Lenovo's website.
I also use the default HDA audio driver from Microsoft. I thought that it was the cause of the issue, but even after installing the 8aad14ww audio driver, audio through the Displayport still won't work.

I notice that when I'm running Windows, the TV detects the video signal as DVI, while on Linux it's HDMI.

Any ideas? Is there a specific graphics driver version with working audio support? A configuration setting buried somewhere?

[rkawakami]

Maybe try this?: http://forum.thinkpads.com/viewtopic.ph ... 55#p738355

[axur-delmeria]

Well, Intel Display Audio never shows up in the Sound Window, even though the device itself shows up in Device Manager, with Intel drivers installed.

No relevant settings show up in Fn+F6. I have Thinkvantage Communications Utility installed, as well as the Hotkeys, Active Protection, Ultranav, and Power Manager.

It's not that important, though. I primarily use Linux and I'm just surprised that it doesn't work in Win 7.

[GomJabbar]

Possibly an adapter issue. The first DisplayPort to HDMI adapter I got would not pass audio, although it was claimed to. I use the following successfully (both video and audio) on my X220 with Windows 7.

http://www.monoprice.com/product?c_id=1 ... 1&format=2