If you have been noticing an annoying popping sound and/or a constant high-pitched tone/squeal coming from the headphone jack of your laptop with a Realtek sound chipset whenever the sound card is inactive (no sounds are playing), here is the fix. 
This problem is apparent on the Asus G73SW, and may be noticeable on other laptops wirh the same/similar audio chipset.
The sound chipset powers down after a specified time of inactivity to save power. This causes the popping noise and the high-pitched tone in the headphone jack. This can be configured in the registry under HKEY_CURRENT_USER\Software\Realtek\RAVCpl64\PowerMgnt.
The settings there are as follows:
DelayTime - time in seconds of inactivity which triggers powering down the sound chipset. Default is 10.
Enabled - enables the power management. Default is 0. Set to 1 to disable and always prevent these noises.
OnlyBattery - If power management is enabled, setting this to 1 will disable power management when the laptop is plugged in. The popping noises will only be heard when the laptop is on battery power, but this helps conserve power so the battery lasts longer.
Convenient .reg files for setting those:
Disable power management always
Disable power management when plugged in
Restart the system for the changes to take effect.
Props for Lunacy for finding this method. 
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Re: Fix for Realtek sound popping and/or high pitched tone/squeal
You could click on the speaker icon in the taskbar and then on 'Mixer' and then mute the sound on the microphone. Find the microphone pin hole on your laptop, it's located somewhere in the front, could be next to the camera sometimes and test the mic ON and OFF and make sure it's off. You could choose to disable it too but you might want to use it sometimes. I had the popping sound problem but muting the MIC fixed it and I don't have any power management option for the audio chip.
Re: Fix for Realtek sound popping and/or high pitched tone/squeal
I would be intrigued if someone could test this solution across multiple laptop models with the stated issue, though I suspect many of them will continue exhibiting the problem due to poor manufacturing quality. Any takers on this one?
Re: Fix for Realtek sound popping and/or high pitched tone/squeal
cant say i have the problem on my 8930g
Aspire 8930G (win7 64bit)18.4" 1920x1080,Intel® Core™2 Extreme Mobile Processor X9100 3.066Ghz(OC to 3.6Ghz6GB DDR3 ,express 54 usb 3.0,120gb ssd/500gb hdd
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