So it turns out that annoying high frequency whine in my soundsystem isn't crappy electrical noise that has been plaguing my wiring for years. It is actually high frequency ultrasonic transmissions that malware has been using to communicate to airgapped computers... one "ghost" located at least. And now we know how the "hypervisor" functions, its probably stored in the realtek firmware, and thats one of the ways it survives reinstalls and BIOS reflashing. Off to find tools to dump the RealTek audio chips, and to try to find clean firmware to compare it to. Haven't ruled out video firmware yet, either.
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