https://bugs.freedesktop.org/show_bug.cgi?id=42353
--- Comment #11 from Raymond <[email protected]> --- 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 -- You are receiving this mail because: You are the QA Contact for the bug.
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