Motherboard connectors pinouts
Intel HD Audio analog front panel dongles can support up to two analog audio jacks, each of which signals user connection, or disconnection.

 

Pin
Number
Pin
Name
Description
1   PORT 1L   Analog Port 1 - Left channel (Microphone) 
2   GND   Ground
3   PORT 1R   Analog Port 1 - Right channel (Microphone) 
4   PRESENCE#    Active low signal that signals BIOS that an Intel® HD Audio dongle is connected to the analog header. PRESENCE# = 0 when an Intel® HD Audio dongle is connected. 
5   PORT 2R   Analog Port 2 - Right channel (Headphone) 
6   SENSE1_RETURN   Jack detection return for front panel (JACK1) 
7   SENSE_SEND    Jack detection sense line from the Intel® HD Audio CODEC jack detection resistor network 
8   KEY   No pin
9   PORT 2L   Analog Port 2 - Left channel (Headphone) 
10   SENSE2_RETURN   Jack detection return for front panel (JACK2) 

Consult the "Front Panel I/O Connectivity Design Guide", p. 22 for more details

10 pin IDC male connector layout
10 pin IDC male connector
at the motherboard (pin 8 is removed)
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Intel High Definition Audio connector visual pinout:
Intel High Definition Audio connector diagram
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Source(s) of this and additional information: http://www.formfactors.org/developer/specs/A2928604-005.pdf
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