Recently re-imaged my 9470m. After finally getting all of the drivers installed, I noticed the audio quality is very poor on the line out/headphone jack. This was not an issue before. It had a nice, full sound when connected to a stereo system or headphones. Now the sound is very thin, almost no low end. I am assuming this is a driver issue. Before I re-imaged, I once rebooted in selective startup and noticed a similar problem which was resolved when I did a normal startup.
Under device manager I've got IDT Hihg Definition Audio CODEC (not sure why there's a codec) and Intel Display Audio, both of which appear to have the correct drivers. I don't see any other audio drivers listed on the HP website for this model.