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Does DisplayPort carry sound as HDMI does? Specifically, I am looking at Lenovo Laptops T410 or T510.

I'm wondering if the spec permits for audio over DP and if possible if the Lenovo laptops I mentioped implement it.

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Yes, the DisplayPort spec is an audio/video interconnect spec. It can carry both audio and video over a single connection. It is rare a laptop implements audio-out over a digital video interconnect. My MacBook Pros don't do it over their DisplayPort outputs, that's for sure.

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That is an important caveat. I think the lesson here is "The specs permit it, but it depends on manufacturer implementation". – horatio Jan 4 '11 at 19:31
@horatio: perfectly put man. – Ian C. Jan 4 '11 at 19:43
My Mid 2010 13" MacBook Pro does output audio from the Mini DisplayPort. The Mini DisplayPort to HDMI adapter must also support audio. – Jim Huang Jan 4 '11 at 20:20
@Jim Huang: interesting. Must be the HDMI-DP adaptor I'm using. It's an early 2010 15" MBPro and a late 2010 13" MBPro I have here. – Ian C. Jan 4 '11 at 21:03
As far as the specific machines in question, I believe Optimus enabled T-series machines are carrying audio over DisplayPort now. I haven't tried myself, though. (The other question is, of course, do you have something on the other end that will receive audio? Haha) – Shinrai Jan 4 '11 at 21:04
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up vote 5 down vote

I also have Lenovo Thinkpad T410. Once you have a video playing, go to Control Panel, Sounds, Manage Audio Devices.

When you're in Manage Audio Devices, you'll see a list of devices and your TV speakers should be one of the options. Just choose it and set it as your default audio device and the sound should automatically come on the TV.

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up vote 1 down vote

Clipped from Wikipedia (buyer beware, but this type of technical information tends to be truthier). It looks like it can be used as a passive pass-through to HDMI with an adapter.

Relationship with HDMI

[...]

The DisplayPort website states that DisplayPort is expected to complement HDMI.[14] DisplayPort can emit HDMI video and audio using passive adapters connected to Dual-mode ports, and supports HDCP content protection used in the HDMI standard.

http://en.wikipedia.org/wiki/DisplayPort#Compatibility_with_HDMI.2FDVI

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