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#21
Both my Windows 7 desktop and Windows 8.1 PC have IDT High Definition Audio CODEC. In the PC I installed an Audigy Sound Blaster FX PCI-e card, but it follows the same pattern as the IDT: there's a slider for line input, but you hear nothing unless you check "Listen to This Device" and hear the post-processor sound.
I also tried using the mic with Skype and Skype sees the microphone/line input, but doesn't hear it, either. So unless I stumble across an astonishing fix I'm going to bite the bullet and spend $150 for a USB interface to do what anything back to Windows 95 would do out of the box.
I've thought I should contact Microsoft or Hewlett-Packard support, but others have already contacted Microsoft to no avail, and is HP going to tell me how to edit my registry? I kinda doubt it.