#5703 HIGH 8.2.0 (: Lid switch detection is unreliable.

[Zarro Boogs per Child]

#5703: Lid switch detection is unreliable.
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   Reporter:  cjb        |       Owner:  dilinger            
       Type:  defect     |      Status:  new                 
   Priority:  high       |   Milestone:  8.2.0 (was Update.2)
  Component:  kernel     |     Version:                      
 Resolution:             |    Keywords:  power               
Next_action:  never set  |    Verified:  0                   
  Blockedby:             |    Blocking:  6590                
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Comment(by dsaxena):

 Replying to [comment:16 wmb at firmworks.com]:
 > I don't think we can distinguish between 2 edges (close open) and 3
 edges (close open close) without using pin readback.
 >

 I've redone the patch my lid detect patch to use the readback (attached).
 It currently does a udelay(100) which is not the nicest thing; however,
 lid/close open is in the suspend/resume path and is not going to block
 anything else important from running. I can do an tasklet/workqueue
 approach too as a test.

 If we go with the of not using  the pos and neg edge detect, I'm not sure
 we can implement what CJB wants in #7536, which  is that when we hit the
 power button to go to sleep, and then hit the power button, we don't want
 to wake up on lid close. Let me percolate on the proposal a bit more.

-- 
Ticket URL: <http://dev.laptop.org/ticket/5703#comment:17>
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