Comment 25 for bug 1487168
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| Raymond (superquad-vortex2) wrote Re: [Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider problem | #25 |
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0e1f616
(Get the code!)
0:76 = 7c20
Miscellaneous Control Bit Register (Index 76h)
bit14 AC97NC
AC ’97 No Compatibility Mode.
This bit allows the surround, center, and LFE volume control registers and output attenuators to operate in a more functional mode than defined by the AC97 2.2 spec. This is called ADI compatibility mode. In AC ’97 compatibility mode, the DAC Gain/Attenuators for the surround, center, and LFE are controlled by Register 18h (PCM volume). The output pin attenuators for the surround are controlled by Register 38h, and the output pin attenuators for the center and LFE are controlled by Register 36h. In ADI compatibility mode, the Surround DAC Gain/Attenuators are controlled by Register 38h, and the Center/ LFE DAC are controlled by Register 36h. The output pin attenuators for Center/LFE are controlled by Register 02h (Master Volume), and the output pin attenuators for Surround are controlled by Register 04h.
0 = AC97 compatibility mode (reset default).
1 = ADI compatibility mode.