Openmoko Bug #2185: AUX button makes interrupt storm

[Openmoko Public Trac]

#2185: AUX button makes interrupt storm
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 Reporter:  vnevoa   |          Owner:  openmoko-devel       
     Type:  defect   |         Status:  new                  
 Priority:  normal   |      Milestone:                       
Component:  unknown  |        Version:  Om2008.9-dev         
 Severity:  normal   |       Keywords:  AUX button interrupts
 Haspatch:  0        |      Blockedby:                       
Estimated:           |    Patchreview:                       
 Blocking:           |   Reproducible:  always               
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 I have difficulty using the AUX button on my GTA02v5 to lock/unlock the
 phone.
 When I press it, it locks, but when I release it, it unlocks again.
 Sometimes it works as intended, but most times it takes a handful of tries
 to (un)lock it.

 This is a recent problem for me, but I can't decide if it is a hardware or
 software problem.

 Looking at "/proc/interrupts", I can see an interrupt storm each time the
 button is pressed or released.

 Initial state:
 root at om-gta02:~# cat /proc/interrupts | grep AUX
  50:        373     s3c-ext  Neo1973 AUX button

 Press the button:
 root at om-gta02:~# cat /proc/interrupts | grep AUX
  50:        375     s3c-ext  Neo1973 AUX button

 Release the button:
 root at om-gta02:~# cat /proc/interrupts | grep AUX
  50:        384     s3c-ext  Neo1973 AUX button

 So, pressing the button causes a couple of interrupts, and releasing it
 causes almost 10.

 I expected the hardware to filter out these bounces. Is it a hardware or
 kernel problem?

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2185>
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