#9412 NORM 1.5-F11: test audio jack sensing on latest kernel

[Zarro Boogs per Child]

#9412: test audio jack sensing on latest kernel
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           Reporter:  dsd        |       Owner:  Quozl   
               Type:  task       |      Status:  assigned
           Priority:  normal     |   Milestone:  1.5-F11 
          Component:  kernel     |     Version:  1.5-A2  
         Resolution:             |    Keywords:          
        Next_action:  never set  |    Verified:  0       
Deployment_affected:             |   Blockedby:          
           Blocking:             |  
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Comment(by Quozl):

 '''Test 1: Does the headphone detection work, and if so how quickly?'''

 Method: set one XO to record, set another XO to play back, place facing
 each other, record the audio and examine the waveform for the delay
 between the peak of the plug removal mechanical noise and the start of the
 audio playback signal through the speakers.

 Result: delay samples 0.13sec, 0.12sec, 0.11sec, 0.12sec.

 Diagnosis: the variability and length of the delay seems inconsistent with
 mechanical electrical switching, and consistent with a kernel response.
 There is a tenth second of comparative silence between the plug removal
 and the kernel switching the speakers on.

 '''Test 2: Is there an underlying mechanical switch?'''

 Method: attach an unterminated 3.5mm stereo plug and see if speaker output
 is stopped.

 Result: output is stopped.

 Diagnosis: there is a mechanical switch.

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Ticket URL: <http://dev.laptop.org/ticket/9412#comment:3>
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