#11222 BLOC Not Tri: XO-1.75 headphone output isn't equal

[Zarro Boogs per Child]

#11222: XO-1.75 headphone output isn't equal
---------------------------------------+------------------------------------
 Reporter:  wad                        |                 Owner:  saadia     
     Type:  defect                     |                Status:  new        
 Priority:  blocker                    |             Milestone:  Not Triaged
Component:  kernel                     |               Version:  1.75-B1    
 Keywords:  XO-1.75, audio, headphone  |           Next_action:  diagnose   
 Verified:  0                          |   Deployment_affected:             
Blockedby:                             |              Blocking:             
---------------------------------------+------------------------------------
 On an XO-1.75 B1 (verified on multiple units), the headphone output has a
 different volume level on the right and left channels.  The left channel
 has an amplitude that is one-fifth the amplitude present on the right
 channel.

 This is seen with both OFW Q4BB08 and the new Linux driver.  Removing the
 protection diodes (D2 and D5) and the ferrites (L18, L17, and measuring
 directly at the chip output give the same result.

 There is no distortion of the left channel (at least, no more than is
 present on the right channel.)

-- 
Ticket URL: <http://dev.laptop.org/ticket/11222>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system