hab mal etwas gesucht für dich und das gefunden, weiss nicht ob es dir hilft:
To stop the USB-area buzz...
Go to:
Device Manager -> Universal Serial Buss controllers -> USB Root Hub (first one, others can be left as default) -> Power Management
Uncheck "Allow the computer to turn off this device to save power" -> Press OK
You should also open "Power Options" in your Control Panel and edit the power scheme settings to how you'd prefer, then save it as a custom setting (i.e. I called mine "My Power Settings"). For some reason if you use some certain default configurations, the noise comes back. If you use a custom profile, it stays away. Go figure. Note that this solution will cause you to sacrifice some battery power. Probably not too much - and if you constantly have anything plugged into your USB port (a mouse, keyboard, etc) while on battery, you won't notice the difference at all. This fix just tells the system that it can never turn the USB port's power off to save power.
gruss micha