#11409 BLOC 1.75-so: Headphone jack test not working in 11.3.0 on 1.75

[Zarro Boogs per Child]

#11409: Headphone jack test not working in 11.3.0 on 1.75
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           Reporter:  greenfeld  |       Owner:  saadia                                      
               Type:  defect     |      Status:  assigned                                    
           Priority:  blocker    |   Milestone:  1.75-software                               
          Component:  kernel     |     Version:  1.75/1.5/1.0 Software Build os883 aka 11.3.0
         Resolution:             |    Keywords:                                              
        Next_action:  code       |    Verified:  0                                           
Deployment_affected:             |   Blockedby:                                              
           Blocking:             |  
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Comment(by Quozl):

 Tests to support diagnosis, using speaker-test at shell prompt:
  * if headphones are inserted after kernel boot, audio is emitted by both
 headphones and speakers,
  * if headphones are inserted before OpenFirmware start, audio is emitted
 only by headphones,
  * if headphones are inserted after OpenFirmware start, at ok prompt,
 before typing boot, audio is emitted by both headphones and speakers.

 Conclusion: OpenFirmware routing of startup sound has an effect.

 Theory: Linux is not setting registers in the same way that OpenFirmware
 does.

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Ticket URL: <http://dev.laptop.org/ticket/11409#comment:5>
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