[pulseaudio-tickets] [Bug 92717] New: deferred volume burst sink volume and mess up balance

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92717

            Bug ID: 92717
           Summary: deferred volume burst sink volume and mess up balance
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: alsa
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: tom.ty89 at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

So basically I have experienced two weird issue with "enable-deferred-volume"
(w/ or w/o flat-volume, the same).

My card is ASUS Xonar Essence STX. Before I did the test cases I made sure
nothing else touches the state/volume of my card (e.g. masked alsa-utils
services and udev rule).

The following is the pairs for sink in `tdbdump
~/.config/pulse/*-device-volumes.tdb` in a fresh set of ~/.config/pulse:

{
key(47) = "sink:alsa_output.pci-0000_07_04.0.analog-stereo"
data(4) = "B\010N"
}
{
key(76) =
"sink:alsa_output.pci-0000_07_04.0.analog-stereo:analog-output;output-speaker"
data(16) = "B\010m\00v\0000B\01fB\01PN"
}

And after I `pacmd set-sink-mute 0 no`, the second pair changes to:

{
key(76) =
"sink:alsa_output.pci-0000_07_04.0.analog-stereo:analog-output;output-speaker"
data(16) = "B\010m\00v\0010B\01fB\01PN"
}

Up til now the volume is -60.00dB.

Then I reboot, the second pair changes again:

{
key(76) =
"sink:alsa_output.pci-0000_07_04.0.analog-stereo:analog-output;output-speaker"
data(26) = "B\011m\02\01\02v\02\00\01\00\00\00\01\00\0010B\01fB\01PN"
}

Now the volume is 0dB. FWIW, the volume will not go up automatically until I
unmute AND reboot.

Then I turn it down to -60.00dB again (but still unmuted) in alsamixer, the
second pair changes to:

{
key(76) =
"sink:alsa_output.pci-0000_07_04.0.analog-stereo:analog-output;output-speaker"
data(26) = "B\011m\02\01\02v\02\00\00\19\9A\00\00\19\9A10B\01fB\01PN"
}

Then if I reboot now, it won't go up to 0dB again.


Another problem is, with deferred volume enabled (again, w/ or w/o
flat-volume), in some random reboot the balance would be messed up.

Assuming the volume was set to 0dB, it will always be the left channel being
lowered to either 1%:

{
key(76) =
"sink:alsa_output.pci-0000_07_04.0.analog-stereo:analog-output;output-speaker"
data(26) = "B\011m\02\01\02v\02\00\00\01\FF\00\01\00\0010B\01fB\01PN"
}


or 10% (-60.00dB):

{
key(76) =
"sink:alsa_output.pci-0000_07_04.0.analog-stereo:analog-output;output-speaker"
data(26) = "B\011m\02\01\02v\02\00\00\19\9A\00\01\00\0010B\01fB\01PN"
}

It seems that with deferred volume disabled, both issue would be gone.

P.S. Is it useful under any circumstances to enable deferred volume but not
flat volume? Since now Arch Linux already disable flat volume by default, I
figure I should propose to disable deferred volume as well.

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