Bug#761515: pulseaudio slowly loses volume balance

[Krylov Ivan]

Package: pulseaudio
Version: 2.0-6.1
Severity: normal

Dear Maintainer,
Using openbox-bound commands:
        <command>amixer sset Master 1%+ >/dev/null</command>
        <command>amixer sset Master 1%- >/dev/null</command>
to control volume, I sometimes notice that volue balance gradually becomes
skewed towards some channel. Indeed, after opening alsamixer I find that
PulseAudio's Master playback channel has one side lower than other.

This happens to both PulseAudio's Master channel and my sound card Master
channel.

-- System Information:
Debian Release: 7.6
  APT prefers stable
  APT policy: (500, 'stable'), (500, 'oldstable')
Architecture: i386 (i686)

Kernel: Linux 3.9-7.dmz.1-liquorix-686 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages pulseaudio depends on:
ii  adduser                       3.113+nmu3
ii  consolekit                    0.4.5-3.1
ii  libasound2                    1.0.25-4
ii  libasound2-plugins            1.0.25-2
ii  libc6                         2.13-38+deb7u4
ii  libcap2                       1:2.22-1.2
ii  libdbus-1-3                   1.6.8-1+deb7u3
ii  libfftw3-3                    3.3.2-3.1
ii  libgcc1                       1:4.7.2-5
ii  libice6                       2:1.0.8-2
ii  libltdl7                      2.4.2-1.1
ii  liborc-0.4-0                  1:0.4.16-2
ii  libpulse0                     2.0-6.1
ii  libsamplerate0                0.1.8-5
ii  libsm6                        2:1.2.1-2
ii  libsndfile1                   1.0.25-5
ii  libspeexdsp1                  1.2~rc1-7
ii  libstdc++6                    4.7.2-5
ii  libsystemd-daemon0            44-11+deb7u4
ii  libsystemd-login0             44-11+deb7u4
ii  libtdb1                       1.2.10-2
ii  libudev0                      175-7.2
ii  libwebrtc-audio-processing-0  0.1-2
ii  libx11-6                      2:1.5.0-1+deb7u1
ii  libx11-xcb1                   2:1.5.0-1+deb7u1
ii  libxcb1                       1.8.1-2+deb7u1
ii  libxtst6                      2:1.2.1-1+deb7u1
ii  lsb-base                      4.1+Debian8+deb7u1
ii  udev                          175-7.2

Versions of packages pulseaudio recommends:
ii  gstreamer0.10-pulseaudio  0.10.31-3+nmu1
ii  pulseaudio-module-x11     2.0-6.1
ii  rtkit                     0.10-2+wheezy1

Versions of packages pulseaudio suggests:
pn  paman             <none>
pn  paprefs           <none>
pn  pavucontrol       <none>
pn  pavumeter         <none>
ii  pulseaudio-utils  2.0-6.1

-- no debconf information