Yeah, another thread about audio issues from the Latitudes. I can't seem to find one that quite matches this issue though. I've noticed what sounds like electrical interference coming out of the onboard speakers, usually when the system is under load. At first I thought it was the hard drive, but then remembered I stuck a solid state drive in there. Stuck my head down there and it was coming from the speakers. It's very quiet, almost inaudible when idle and at normal room noise floor. However, under load, it gets quite audible and annoying, and continues whether or not headphones are plugged in. The only time I've noticed they don't put out any noise is in the BIOS (I will boot into a different OS off of a flash drive to check for software issues though). The noise is very similar to lifted grounds/ground loops one would notice in any other audio system, but it isn't carried into headphones. I don't have much use for the built-in speakers, and I could very easily disconnect them, but I would really love to figure out what's causing this. Noise is also carried through on battery, charger, and both. Any ideas?
Latitude E6500
Windows 7 x64 Professional
All current drivers from Dell except audio from MSFT and display from nVidia