ACPI and power management fixes for 3.11-rc3

- Revert of the ACPI video commit that I hoped would help fix
  backlight problems related to Windows 8 compatibility on some
  systems.  Unfortunately, it turned out to cause problems to happen
  too.

- Fix for two problems in intel_pstate, a possible failure to respond
  to a load change on a quiet system and a possible failure to select
  the highest available P-state on some systems.  From Dirk Brandewie.

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