[pulseaudio-tickets] [Bug 42353] Mistreats headphone port with dysfunctional ALSA Master volume on ICH7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42353

--- Comment #11 from Raymond <superquad.vortex2 at gmail.com> ---
MASTER VOLUME REGISTER  Index 0x02

 This register controls the Line_Out volume controls for both stereo channels
and the mute bit. Each volume subregister 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 or D13 bits are set to 1,
their respective lower five volume bits are automatically set to 1 by the codec
logic. On readback, all lower five bits read 1s whenever these bits are set to
1. Refer to Table 12 for examples.  



HEADPHONE VOLUME REGISTER  Index 0x04 
This register controls the headphone volume controls for both stereo channels
and the mute bit. Each volume subregister 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 or D13 bits are set to 1,
their respective lower five volume bits are automatically set to 1 by the codec
logic. On readback, all lower five bits read 1s whenever these bits are set to
1. Refer to Table 12 for examples.  


this is quite different from those virtual master of hda codecs

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