08-19-2013 07:01 AM
This might be a no-brainer for some folks, but I thought this should be documented somewhere searchable.
I use an E530c for work, and noticed that I got audio noise/static/pops on my headphones even when the sound is muted. I found some forum posts for older models which seem to blame the motherboard/general design.
It looks like for this model, the fix is a lot simpler. Don't use the USB port immediately next to the audio jack. As soon as I unplugged my optical mouse from that jack, the noise disappeared. It seems like some other USB devices do not cause the noise - just the optical mouse.