Problems using HDMI connection

I have a HP dv4-1028us with the x4500mhd, p8400, 4 gig ram. When I hook up my HD TV via HDMI, everything looks and sounds fine until anything moves on the screen. So If I load up iTunes I can listen to music ok, but if I turn the visualizations on, the audio starts lighlty popping and crackling. I've updated my video and audio drivers. If I mute my PC I don't get the sound. If I don't have the pc muted and I also have nothing driving an audio signal (such as itunes, media player, etc.) I still get the sound. It does this whether I'm watching a movie or playing a game. anything that causes movement on the screen. no movement on the screen = no light popping or crackling.

help!

 

I have the same problem with my HP dv4-1125nr. The audio out of the HDMI port to a HDTV or a monitor with integrated speaker is has a lot of pops and cliks and cracks and all sorts of noise.
If the processore is not heavily loaded the sound is better but if you move windows around or play a process intensive clip the audio is very noisy.
I posted this on cnet reviews

ok as a stand alone machine but you will have problems justifying the added cost of having the HDMI feature.
If you are thinking of connecting an external monitor to this device or use it with your HDTV you will run into performance issues. The video quality is not great, the video setting optimisation is limited but worse of all the audio quality out of the HDMI link is really bad.
When playing a video clip either personal or downloaded from the internet the sound out of the HDMI connection has lots of pops and clicks. Even when the screen saver is running, the audio output is let's say very annoying.
If you were hoping to use this laptop to watch movies the experience will be very bad when using an external digital monitor.
I called HP multiple times and they had no idea on how to fix it. The basic suggestions (change the cable or try a different monitor) do not work. They suggested bringing the laptop back to Best-Buy. Well I tried a new laptop there with the Geek-squad and all the laptops (HP dv4-1125nr) had the same issue. Worse of all, Best Buy cannot even process a return on this machine as HP does not autorize a repair (not sure what that means) but basically I am stuck with a laptop with a bad HDMI audio.
I hope HP is looking into this issue. When playing regular DVDs the "noise" is not so pronounced but still bad for a good movie experience, when playing highly compressed files (MP4, etc) the sound is really bad.

 

bump. Has anyone found a fix to this yet?