Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
  ACPI: introduce kernel parameter acpi_sleep=sci_force_enable
  ACPI: WMI: Survive BIOS with duplicate GUIDs
  dell-wmi - fix condition to abort driver loading
  wmi: check find_guid() return value to prevent oops
  dell-wmi, hp-wmi, msi-wmi: check wmi_get_event_data() return value
  ACPI: hp-wmi, msi-wmi: clarify that wmi_install_notify_handler() returns an acpi_status
  dell-wmi: sys_init_module: 'dell_wmi'->init suspiciously returned 21, it should
  ACPI video: correct error-handling code
  ACPI video: no warning message if "acpi_backlight=vendor" is used
  ACPI: fix ACPI=n allmodconfig build
  thinkpad-acpi: improve Kconfig help text
  thinkpad-acpi: update volume subdriver documentation
  thinkpad-acpi: make volume subdriver optional
  thinkpad-acpi: don't fail to load the entire module due to ALSA problems
  thinkpad-acpi: don't take the first ALSA slot by default