a 2nd crash on the brightness page is here 
https://errors.ubuntu.com/oops/8b4c50d4-5bb2-11e4-8f6d-fa163e78b027

StacktraceTop   
setImplicitDestructible (this=<optimized out>) at 
../../include/QtQml/5.3.0/QtQml/private/../../../../../src/qml/qml/qqmldata_p.h:115
(anonymous namespace)::CallArgument::toValue (this=<optimized out>, 
engine=engine@entry=0x14c0208) at jsruntime/qv4qobjectwrapper.cpp:1708
CallMethod (object=object@entry=0x1580ea8, index=<optimized out>, 
returnType=returnType@entry=39, argCount=<optimized out>, argTypes=0x1b7167c, 
engine=engine@entry=0x14c0208, callArgs=callArgs@entry=0xaf8006c0) at 
jsruntime/qv4qobjectwrapper.cpp:1136
CallPrecise (object=object@entry=0x1580ea8, data=..., 
engine=engine@entry=0x14c0208, callArgs=callArgs@entry=0xaf8006c0) at 
jsruntime/qv4qobjectwrapper.cpp:1386
QV4::QObjectMethod::callInternal (this=<optimized out>, callData=0xaf8006c0) at 
jsruntime/qv4qobjectwrapper.cpp:1875 

** Description changed:

  Summary:
  System settings crashes after selecting brightness '
  
  Steps: (race condition, can take 1 try or 50 tries)
  1. open system settings
  2. open battery
  3. select display brightness
  4. use back arrow on header twice to go to main system-settings page
  5. select brightness on the main page
  6. repeat steps 2-5 until system-settings crashes
  
  expected results:
  system-settings never crashes
  
  actual results:
- a crash happens 
+ a crash happens, system settings app is frozen
  
  additional version info in crash file:

** Tags added: qa-daily-testing qasoak rtm14

** Changed in: ubuntu-system-settings (Ubuntu)
       Status: New => Confirmed

** Changed in: ubuntu-system-settings (Ubuntu)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1385467

Title:
  System settings crashes after selecting brightness

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