” Mono Volume Register (Index 06h) Reg No.Name
D15D14D13D12D11D10D9D8D7D6D5*D4D3D2D1D0
Default 06h
Mono Volume
MVM X X X X X X X X X MV5 MV4 MV3 MV2 MV1 MV0 8000h
*Refer to Table II for examples. This register controls the Mono output
volume and mute bit. The volume register contains five bits, generating
32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines
6-bit volume registers, to maintain compatibility, whenever the D5 bit
is set to “1,” their respective lower five volume bits are automatically
set to “1” by the codec logic. On readback, all lower five bits will
read “1s” whenever this bit is set to “1.” All registers not shown and
bits containing an X are assumed to be reserved.
MV[5:0] Mono Volume Control. The least significant bit represents 1.5 dB. This
register controls the output from 0 dB to a maximum attenuation of 46.5 dB.
MVM Mono Volume Mute. When this bit is set to “1,” the channel is muted.
** Changed in: virtualbox (Ubuntu)
Status: Incomplete => Confirmed
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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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