--- ac.c.orig	2004-08-15 14:34:03.000000000 -0400
+++ ac.c	2004-08-15 14:37:43.000000000 -0400
@@ -219,6 +219,7 @@
 
 	switch (event) {
 	case ACPI_AC_NOTIFY_STATUS:
+	case ACPI_NOTIFY_BUS_CHECK:
 		acpi_ac_get_state(ac);
 		acpi_bus_generate_event(device, event, (u32) ac->state);
 		break;
@@ -272,6 +273,15 @@
 		goto end;
 	}
 
+	status = acpi_install_notify_handler(ac->handle,
+		ACPI_SYSTEM_NOTIFY, acpi_ac_notify, ac);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error installing system notify handler\n"));
+		result = -ENODEV;
+		goto end;
+	}
+
 	printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 
 		acpi_device_name(device), acpi_device_bid(device), 
 		ac->state?"on-line":"off-line");
@@ -307,6 +317,12 @@
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 			"Error removing notify handler\n"));
 
+	status = acpi_remove_notify_handler(ac->handle,
+		ACPI_SYSTEM_NOTIFY, acpi_ac_notify);
+	if (ACPI_FAILURE(status))
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error removing system notify handler\n"));
+
 	acpi_ac_remove_fs(device);
 
 	kfree(ac);