Those drivers should have been installed when you bought the XPS? I have used headphones once, and they did work I recall? This is the direct link to the Dell Driver, [URL]  Before you install that, did you look in Device Manager? Should see this: First the Audio devices: [IMAGE]   Then the Software Components: [IMAGE]   I've got an Nvidia card and it also installs Audio drivers as you can see on the top screen capture. Does any of the 3 REAR Jacks work?
The front audio jack requests what I just plugged in. I specify headphones. However, an error message appears: Windows cannot find 'C:\Program Files\Realtek\Audio\HDA\RtkNGui64.exe'. I have tried installing Realtek drivers, but they all report there is no Realtek hardware. How can I listen to my computer through this port, please?
XPS 8940, front audio jack requires Realtek driver