http://www.macnn.com/articles/10/05/26/boot.camp.update.fixes.control.panel.issue/
Apple updates Boot Camp, Mac OS X 10.6.4 beta
updated 09:20 am EDT, Wed May 26, 2010
Boot Camp update fixes control panel issue
Apple has released a pair of minor software updates, beginning with the Boot Camp Update for MacBook Pro. The patch applies exclusively to the 13-inch Pro refreshed this year, which has had problems with headphone output, and the Boot Camp Control Panel when selecting the brightness tab. Different downloads are available for 32-bit and 64-bit installations of Windows.
The developer beta of Mac OS X 10.6.4 has been updated with a new build, 10F58. The release comes a week after the last, 10F54, and is said to have grown only 5MB in size to reach 581.3MB. Correspondingly there are said to be virtually no new changes, and no outstanding issues. Slowed evolution could indicate that a public release is due in the near future.
