I currently have an HP8510w notebook running Vista Business. I am trying to play my ipod through the speakers and can't seem to get the signal to passthru. I have verified the recording level in the "Recording Devices", but the sound will not pass from the input device to the output device. I can also record the sound with my Audio recording software (Adobe Audition) and play it back in the speakers, but it will not play realtime. This HP model has "SoundMax Integrated Digital HD Audio" hardware with the most up to date drivers.
On another note, the speakers "level" options include the "line in", but no "microphone" option for adjustment. When I am attached to my docking stations (which has a line in jack), the setup works just fine, except that I'm on the road and my docking station is in the office.