pm-suspend could reproduce this bug, fail rate is around one out of ten.

steps to reproduce this message instead of using checkbox:
  * boot the system
  * use command "pm-suspend", then the system will go to suspend
  * after make sure the system has suspended, click mouse or keyboard to wake 
up the system
  * command "dmesg | grep PSR" to check whether the message pop up
  * if no such message, use command "dmesg -C" to clean the buffer and do the 
steps again from the bullet 2 until you get the message

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https://bugs.launchpad.net/bugs/1248865

Title:
  [HP Paviliion dm1] [\_SB_.ACAD._PSR] [AE_ALREADY_EXISTS] ACPI Error
  message in kernel log after suspend resume

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