It is analog:
From page 26 of the PDF:
The audio subsystem supports the following features:
• Analog line-out/Analog Headphone/Analog Microphone (front panel jack)
It also has the pinout of the plug.
Can't understand what Intel HD audio is if it is not digital. Analog HD audio?
"• Intel HD Audio via a stereo microphone/headphone jack on the front panel "
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It looks like the characteristics of the front panel analog port are part of the Intel HD audio specification for PCs:
You can get digital signals via the HDMI or Displayport connectors.