diff -ru linux-2.6.17-rc6-mm2.a/drivers/acpi/ec.c linux-2.6.17-rc6-mm2.b/drivers/acpi/ec.c
--- linux-2.6.17-rc6-mm2.a/drivers/acpi/ec.c	2006-06-21 03:02:26.000000000 +0400
+++ linux-2.6.17-rc6-mm2.b/drivers/acpi/ec.c	2006-06-21 02:58:05.000000000 +0400
@@ -212,7 +212,7 @@
 
 	switch (event) {
 	case ACPI_EC_EVENT_IBE:
-		if (~acpi_ec_read_status(ec) & event) {
+		if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) {
 			ec->intr.expect_event = 0;
 			return 0;
 		}
@@ -771,12 +771,15 @@
 	case ACPI_EC_EVENT_OBF:
 		if (!(value & ACPI_EC_FLAG_OBF))
 			break;
+		ec->intr.expect_event = 0;
+		wake_up(&ec->intr.wait);
+		break;
 	case ACPI_EC_EVENT_IBE:
 		if ((value & ACPI_EC_FLAG_IBF))
 			break;
 		ec->intr.expect_event = 0;
 		wake_up(&ec->intr.wait);
-		return ACPI_INTERRUPT_HANDLED;
+		break;
 	default:
 		break;
 	}