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authorMatthew Garrett <mjg59@srcf.ucam.org>2008-08-06 19:12:04 +0100
committerLen Brown <len.brown@intel.com>2008-10-16 14:17:06 -0400
commita68823ee5285e65b51ceb96f8b13a5b4f99a6888 (patch)
tree95ac0c8d54b0a358efb1dee9f9a0478a09657075
parent3fa8749e584b55f1180411ab1b51117190bac1e5 (diff)
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>
-rw-r--r--drivers/acpi/hardware/hwsleep.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
index dba3cfbe8cb..130a44b7968 100644
--- a/drivers/acpi/hardware/hwsleep.c
+++ b/drivers/acpi/hardware/hwsleep.c
@@ -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 */