[pulseaudio-tickets] [PulseAudio] #872: Loss of sound with two sink inputs (was: Loss of sound with two sources)

[PulseAudio]

#872: Loss of sound with two sink inputs
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  Reporter:  AdamK   |       Owner:  lennart
      Type:  defect  |      Status:  new    
 Milestone:          |   Component:  daemon 
Resolution:          |    Keywords:         
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Comment(by coling):

 Could this be a result of artefacts from the "Flat Volumes" feature?
 (pulseaudio will always try and use h/w volume whenever possible to reduce
 overhead and thus power consumption etc - and thus when there is only one
 stream playing, the volume of that stream will always be the same as the
 underlying alsa volume - although the concept of a "system volume" is
 still maintained and presented to the user even if it's not really used
 like that underneath!)

 To test this, load up alsamixer -c0 and have a look at the bars for Master
 and maybe PCM too. When your second "sink input" (source is not the right
 term as a "source" is a recording device - e.g. a mic. I've fixed the
 summary to reflect this.) starts (and you hear your dropout), do you see
 them jump about a bit?

 If so, you can work around this by disabling flat-volumes in daemon.conf.
 Git master already has support to minimise the fallout from this - which
 stems from there being no way to synchronise mixer changes in alsa - so if
 this is the problem you are seeing, it's likely fixed already :)

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Ticket URL: <http://pulseaudio.org/ticket/872#comment:1>
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