Hello, I had suffered from this bug, too, and can testify that updating the BIOS on my Dell Studio 1555 to the latest A13 version (http://www.dell.com/support/drivers/us/en/19/DriverDetails?driverId=R301502) has solved the problem.
-- Best Regards, Aleksander Adamowski http://olo.org.pl -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org