[pulseaudio-tickets] [Bug 58313] New: Pulseaudio glitches volume of non-alsa applications when all alsa applications quits

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58313

          Priority: medium
            Bug ID: 58313
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: Pulseaudio glitches volume of non-alsa applications
                    when all alsa applications quits
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ntrrgc at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: alsa
           Product: PulseAudio

Steps to reproduce:
0. If you have any sound applications running, quit them.
1. Open a pulseaudio application. Most modern linux music players will suffice,
like mplayer or rhythmbox. Play something loud.
2. Use pavucontrol to lower the volume of the application (not the card!) at
low but hearable one. Assert yourself the card volume is set at maximum in
pavucontrol.
3. Launch an alsa application, i.e. mplayer -ao alsa.
4. Quit it. You may hear a glitch for a fraction of second. I suspect this
glitch comes from pulseaudio playing a piece of the sound buffer at maximum
volume, regardless of which volume has the application set.

This is less noticeable the higher the volume of the pulseaudio application is.

This is very annoying with IM clients like gajim and Psi+, which play message
notification sounds with alsa.

Ugly workaround (and hint):
If you run an alsa application and let it running, appearing at pavucontrol,
but without playing anything (i.e. run mplayer -ao alsa, and let it paused), no
glitch will be heard, since it only happens when *all* alsa applications have
quit.

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