W520 config:
   Ubuntu 11.04  64 bit
   12 GByte Ram
   SSD + HD
   Nvidia M2000

freezing on:
   1. BIOS discrete + "change brightness Fn+Pos1 / Fn+End"
   2. BIOS integrated + "powersave-setting energysaving on AC after 1 hour" -> 
never wakeup from energysaving-state (ramsleep)
   3. BIOS integrated + "playing sound" (while editing this bug report :o) ... 
Display-Content/Mouse freeze + sound playing endless-loop

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https://bugs.launchpad.net/bugs/776999

Title:
  [Lenovo W520] laptop freezes on ACPI-related actions

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