#9798 BLOC 1.5-sof: camera LED on when recording is not happening

[Zarro Boogs per Child]

#9798: camera LED on when recording is not happening
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           Reporter:  mikus     |       Owner:  jon.nettleton                    
               Type:  defect    |      Status:  new                              
           Priority:  blocker   |   Milestone:  1.5-software-final               
          Component:  kernel    |     Version:  Development build as of this date
         Resolution:            |    Keywords:  os51                             
        Next_action:  diagnose  |    Verified:  0                                
Deployment_affected:            |   Blockedby:                                   
           Blocking:            |  
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Comment(by wad):

 Replying to [comment:5 dsd]:
 > Jon says:
 >
 > {{{
 > I'm pretty sure I know what's going on there - it's the X server.  The
 > camera got put onto a couple of GPIO lines which were really meant for
 > talking to monitors, and the X server is trying to do that.  So it
 > powers up the camera.  That, I believe, is where the fix need to be.
 > }}}

 Jon is wrong about this.   The I2C bus used to talk to the camera is one
 that might be used by X to talk to a display, but the I2C bus has nothing
 to do with powering up the camera.

 Powering the camera on is what turns on the camera LED.   This is
 controlled by VGPIO3.

 There is a known issue that if you have the serial port enabled, or have a
 serial adapter connected to the processor serial port, the camera power is
 backfed and the LED is dimly lit.

 There might be an issue with the I2C bus back-feeding the camera power
 supply.  If this is the case, the LED will be dimly, not fully lit.

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Ticket URL: <http://dev.laptop.org/ticket/9798#comment:9>
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