[Bugs] #4287 sugar-toolkit-gtk3 UNSP: Bad volume saving behaviour when no sound device is found

[Sugar Labs Bugs]

#4287: Bad volume saving behaviour when no sound device is found
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    Reporter:  dsd                        |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit-gtk3         |        Version:  Unspecified                
    Severity:  Minor                      |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 The acme-volume-alsa.c code looks for a sound mixer called "Master",
 falling back on "PCM" if it doesn't exist.

 During XO-4 development we have not had either mixer for a while. This has
 revealed some strange behaviour when we later add a Master/PCM mixer:

 If no mixer could be found, acme_volume_alsa_get_volume() returns "0". (It
 would also return 0 for a mixer where the sound was turned all the way
 down)

 Sugar then saves that 0 to gconf (jarabe.model.sound), and when we later
 add a kernel with PCM and/or Master mixers, Sugar starts setting volume 0
 there.

 Not a major issue since it wouldn't hit a "sane" setup. However it has
 caused some annoyance and confusion during our developer activities right
 now. It would also affect someone who installs Sugar on a system without a
 sound card, and then adds a sound card later.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4287>
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