Can confirm that XPS13 booting UEFI is broken by the update to 3.8.0-30; brightness is not adjustable again. Fixed by reverting to the 3.8.0-29 kernel.
Can confirm that XPS13 booting UEFI is broken by the update to 3.8.0-30; brightness is not adjustable again. Fixed by reverting to the 3.8.0-29 kernel.