#9505 NORM Not Tri: XO-1 OS doesn't turn off speaker amplifier when on mute

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#9505: XO-1 OS doesn't turn off speaker amplifier when on mute
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 Reporter:  TMarques  |                 Owner:  marco        
     Type:  defect    |                Status:  new          
 Priority:  normal    |             Milestone:  Not Triaged  
Component:  sugar     |               Version:  not specified
 Keywords:            |           Next_action:  code         
 Verified:  0         |   Deployment_affected:  All          
Blockedby:            |              Blocking:               
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 Alsamixer has a switch to turn off the speakers external amplifier when
 the sound is muted, which results in a slight hum coming from the
 speakers. James Cameron measured the current consumed:

 "...with or without backlight, without any battery, I saw a 20mA (+/-
 10mA)
 improvement as a result of disabling the amplifier with alsamixer.  The
 hiss from the speakers also went away.  (I had to place my ears within a
 few inches to be able to hear the change).  The input voltage 12.06V.
 There was no change to the current consumed during suspend."

 After a short discussion on the mailing list, it was decided that this
 might be something worth pursuing due to power savings.

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Ticket URL: <http://dev.laptop.org/ticket/9505>
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