[Bugs] #4356 Measure UNSP: Measure stops measuring after switching activities and returning

[Sugar Labs Bugs]

#4356: Measure stops measuring after switching activities and returning
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    Reporter:  carrott                    |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Measure                    |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 Unfortunately I don't have a reliable steps to reproduce for this.
 Sometimes, when I return to measure after using another activity, there is
 no signal displayed.

 This sequence or a variation on it triggers the bug perhaps 30% of the
 time on Measure 44 on 13.1.0 build 20 on XO-4 and XO-1.75:

 Reboot laptop[[BR]]
 Start Measure[[BR]]
 Select ukulele tuning mode[[BR]]
 Adjust to 50Hz/division
 Observe signal[[BR]]
 Return to activity ring[[BR]]
 Observe microphone light does not go out and laptop is sluggish (I guess
 this is a separate bug)[[BR]]
 Start Browse[[BR]]
 Observe microphone light goes out[[BR]]
 Use Browse for a while including allowing the laptop to suspend[[BR]]
 Return to Measure[[BR]]
 Repeat the previous two steps until you observe the microphone light
 illuminates but no signal is displayed by measure[[BR]]

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4356>
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