---
 drivers/acpi/scan.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/acpi/scan.c
===================================================================
--- linux-2.6.orig/drivers/acpi/scan.c	2009-05-12 13:06:45.000000000 +0800
+++ linux-2.6/drivers/acpi/scan.c	2009-05-27 10:47:22.000000000 +0800
@@ -865,7 +865,13 @@
 	/* TBD: System wake support and resource requirements. */
 
 	device->power.state = ACPI_STATE_UNKNOWN;
-	acpi_bus_get_power(device->handle, &(device->power.state));
+	if (!strncmp(acpi_device_bid(device), "CDB0", 4) ||
+		!strncmp(acpi_device_bid(device), "CDB1", 4)) {
+		printk(KERN_DEBUG "skip getting the power state for %s\n",
+			acpi_device_bid(device));
+	} else {
+		acpi_bus_get_power(device->handle, &(device->power.state));
+	}
 
 	return 0;
 }