#10419 NORM Not Tri: XO 1.5 high-pitched noise/whine on trackpad movement in certain activites on external power

[Zarro Boogs per Child]

#10419: XO 1.5 high-pitched noise/whine on trackpad movement in certain activites
on external power
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 Reporter:  greenfeld  |                 Owner:  wad          
     Type:  defect     |                Status:  new          
 Priority:  normal     |             Milestone:  Not Triaged  
Component:  hardware   |               Version:  not specified
 Keywords:             |           Next_action:  never set    
 Verified:  0          |   Deployment_affected:               
Blockedby:             |              Blocking:               
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 With the XO 1.5, I hear a high-pitched noise/whine when using the trackpad
 in certain activities, notably eToys and Scratch.  However this whine
 seems to only happen (or at least be much more noticeable to me) when the
 laptop is running on external power.  The power adapters used have varied,
 but include the stock XO 1.5 AC adapter, as well as a few other various
 XO-supporting AC adapter types we have around the office.

 The noise/whine reminds me of old TV/CRT oscillators, although it warbles
 a bit and is not a single constant tone.  Said noise seems to come from
 the speakers (or elsewhere in the main top area) and does not get
 redirected into a headset if plugged in.

 Removing the AC adapter causes the noise to quickly fade (if you are
 moving your mouse over the touchpad while doing this) and then go away.


 Reproduction:
 1. Startup Etoys or Scratch with an AC adapter plugged in with an XO 1.5
 (I'm using production models of SKU 99 as best as I know).
 2. Move your mouse along the touchpad with your head somewhat nearby the
 XO and listen.

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Ticket URL: <http://dev.laptop.org/ticket/10419>
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