[PATCH] Clear WAK_STS on resume

[Matthew Garrett <mjg59@srcf.ucam.org>]

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.

Signed-off-by: Matthew Garrett <mjg@redhat.com>

---

I've had it confirmed by AMI that some of their BIOSes make this 
assumption - there may well be others out there as well.

diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
index dba3cfb..1cda856 100644
--- a/drivers/acpi/hardware/hwsleep.c
+++ b/drivers/acpi/hardware/hwsleep.c
@@ -627,6 +627,9 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 	}
 	/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 
+	/* Clear wake status */
+	acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
+
 	acpi_gbl_system_awake_and_running = TRUE;
 
 	/* Enable power button */

-- 
Matthew Garrett | mjg59@srcf.ucam.org