Latitude E5530 audio problem headphones

Hi,
I have a Latitude E5530, with Windows 7 64-bit.
This notebook was formatted a couple of days ago, and underwent a re-installation from scratch.
I installed all the drivers you can find on the website. The audio works well with the speakers, but you hear no sound if you plugin the headphones. I don't know if it worked before the format; what I know is that running a different operating system (Xubuntu 13.04 64.bit) everything works like a charm, no audio problems whatsoever.

Any clues about what is going on here?

Thanks!