[pulseaudio-tickets] [PulseAudio] #743: Sound disappears when some app tries to access alsa

[PulseAudio]

#743: Sound disappears when some app tries to access alsa
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  Reporter:  walmis  |       Owner:  lennart
      Type:  defect  |      Status:  new    
 Milestone:          |   Component:  daemon 
Resolution:          |    Keywords:         
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Comment(by coling):

 I presume the apps that trigger this disappearance are trying to access
 the alsa h/w directly? Can you get a very basic test case using only
 aplay? e.g. aplay -D hw:0,0? If pulse borks with this test case then this
 is likely a problem at the alsa level (trying to open the device a second
 time should really fail (for 90% of audio h/w) or be allowed due to
 hardware mixing. I'm guessing that either a) Alsa is giving us some kind
 of signal we don't handle properly (no idea if this is the what is
 happening as I don't knwo this code in PA too well, but I suspect it's not
 the case.) or b) Alsa level playback is somehow borked when opening things
 twice.

 Another interesting test woudl be to run:
  1) Terminal 1: pasuspender cat
  2) Terminal 2: aplay -D hw:0,0
  3) Terminal 3: aplay -D hw:0,0 (again!)

 If 3) causes the playback in 2) to get messed up then you know this is
 definitely an alsa bug... (although if it works fine, it doesn't mean to
 say it's not an alsa bug!).

 Please note that there is a pulseaudio output module for wine which may
 work around the problem...

 Lennart, any ideas?

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Ticket URL: <http://pulseaudio.org/ticket/743#comment:2>
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