Bit = 1 ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7 ID8 ID9

Function Dedicated Mic 
PCM In Channel 
Modem Line Codec Support 
Bass and Treble Control 
Simulated Stereo (Mono to Stereo) 
Headphone Out Support 
Loudness (Bass Boost) Support 
18-Bit DAC Resolution 
20-Bit DAC Resolution 
18-Bit ADC Resolution 
20-Bit ADC Resolution 


AD1980 
0 0 0 0 1 0 0 1 0 0

a reset register of real ad1980 return 0x0090 which indicate 20 bit DAC
resolution and Headphone support

but enumerated ad1980 return 0

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https://bugs.launchpad.net/bugs/1487168

Title:
  [Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
  problem

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