MacBook Pro: Audio distortion when using DVI

MacFixIt reader Mauricio Ardila reports an issue where the MacBook Pro generates noise interference and audio distortion when a DVI video-out device is connected.

Mauricio writes:

"If you use the line out of the MacBook Pro while using the DVI video out, as it would be the case as when doing a Keynote/PowerPoint presentation for example, the audio output has a lot of distortion and noise. Disconnecting the DVI connector silences the noise and the line out is usable again. 

"I have hooked my new MacBook Pro to my professional speakers in the studios at work and at home, have tried several cables, connections, patchbays, etc. and the one thing that quiets out the line out is disconnecting the DVI. I am going to measure the distortion specs because this is just NOT acceptable. I can deal with the whine, by working with the PhotoBooth "fix". I can deal wih the excessive heat, by buying some fans and put the MacBook Pro on a stand. But having this noise out of the line out is just plain bad design, and one bug, that does interfere with my professional life. 

"I also tried closing the lid and only running from an external monitor, the MacBook Pro's screen off. The noise is still there, so it is probably a hardware problem that arises from using the DVI video out and not a dual screen problem."

If you are experiencing a similar issue, please let us know.

For more coverage see our MacBook Pro special report.

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