[pulseaudio-tickets] [Bug 92207] New: Disabling flat volumes triggered master volume level to reach 100% while trying to decrease/increase it

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92207

            Bug ID: 92207
           Summary: Disabling flat volumes triggered master volume level
                    to reach 100% while trying to decrease/increase it
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: core
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: germano.massullo at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Created attachment 118554
  --> https://bugs.freedesktop.org/attachment.cgi?id=118554&action=edit
pulseaudio logs

(Downstream bugreport at https://bugzilla.redhat.com/show_bug.cgi?id=1265830 )

Description of problem:
Days ago I disabled PulseAudio's flat volumes due PulseAudio:
- crackling audio trouble (bugreport #92031)
- inability to correctly handle application bad behaviour about volume levels
https://bugzilla.redhat.com/show_bug.cgi?id=1265267

Disabling PulseAudio's flat volumes solved the mentioned problems, but
introduced a new one.
I usually increase / decrease volume level by using mouse wheel on KMix icon.
Both actions sometimes trigger the master volume to 100% level. While
collecting PulseAudio logs, I managed to reproduce (twice) the problem:
Note: each mousewheel step increases or decreases volume level by a 5%.

===First occurrence of the problem===
At line number 1359 you can see the volume setted at 70%:
A few moments later, I tried to increase it at 75%, but the volume level has
been pushed to 100% (line number 1459).

===Second occurrence of the problem===
At line number 18000 you can see the volume setted at 40%:
A few moments later, I tried to increase it at 45%, but the volume level has
been pushed to 100% (line number 18016).


Since on the logs, every volume level change has the form of

D: [alsa-sink-Multichannel] alsa-sink.c: Requested volume: front-left: 65536 /
100% / 0,00 dB,   front-right: 65536 / 100% / 0,00 dB

that "Requested volume" makes me think about PulseAudio being requested to set
the volume to 100%. So in the dubt I added in CC some guys of KDE SIG and alsa.

I can quite easly reproduce the problem, so feel free to ask me to do any test.


Version-Release number of selected component (if applicable):
pulseaudio-6.0-8.fc22.x86_64
kmix-15.04.0-1.fc22.x86_64

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/pulseaudio-bugs/attachments/20150930/f37ea2c5/attachment.html>