Commit a68823ee authored Aug 06, 2008 by Matthew Garrett Committed by Len Brown Oct 16, 2008

ACPI: Clear WAK_STS on resume

The leading other brand OS appears to clear the WAK_STS flag on resume.
When rebooted, certain BIOSes assume that the system is actually
resuming if it's still set and so fail to reboot correctly. Make sure
that it's cleared at resume time.

Comment clarified as suggested by Bob Moore

http://bugzilla.kernel.org/show_bug.cgi?id=11634



Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Romano Giannetti <romano.giannetti@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

parent 3fa8749e

drivers/acpi/hardware/hwsleep.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -627,6 +627,13 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
		}
		/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */

		/*
		* Some BIOSes assume that WAK_STS will be cleared on resume and use
		* it to determine whether the system is rebooting or resuming. Clear
		* it for compatibility.
		*/
		acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);

		acpi_gbl_system_awake_and_running = TRUE;

		/* Enable power button */