diff -r 3044873a84b7 drivers/acpi/hardware/hwregs.c
--- a/drivers/acpi/hardware/hwregs.c	Tue May 13 10:28:48 2008 +0100
+++ b/drivers/acpi/hardware/hwregs.c	Thu Jun 12 20:59:04 2008 +0800
@@ -665,8 +665,6 @@ acpi_status acpi_hw_register_write(u8 us
 
 		/*
 		 * Perform a read first to preserve certain bits (per ACPI spec)
-		 *
-		 * Note: This includes SCI_EN, we never want to change this bit
 		 */
 		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 					       ACPI_REGISTER_PM1_CONTROL,
diff -r 3044873a84b7 include/acpi/aclocal.h
--- a/include/acpi/aclocal.h	Tue May 13 10:28:48 2008 +0100
+++ b/include/acpi/aclocal.h	Thu Jun 12 20:59:04 2008 +0800
@@ -708,7 +708,7 @@ struct acpi_bit_register_info {
  * must be preserved.
  */
 #define ACPI_PM1_STATUS_PRESERVED_BITS          0x0800	/* Bit 11 */
-#define ACPI_PM1_CONTROL_PRESERVED_BITS         0x0201	/* Bit 9, Bit 0 (SCI_EN) */
+#define ACPI_PM1_CONTROL_PRESERVED_BITS         0x0200	/* Bit 9 (whatever) */
 
 /*
  * Register IDs