Dell studio 1555 Keyboard Eject key, brightness up down not functioning

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http://forums.fedoraforum.org – I have Dell studio 1555 Laptop, I installed Fedora 12, if I press brightness control key's, menu comes but brightness is not varying and dvd drive eject key is also not functioning,but sound control Keys are working. If I put the cd or dvd in drive it will show the content and dvd has to be removed by right clicking on disk Icon in desktop and selecting the EJECT, But in case of Blank Cd/DVD even that will not work. I have to shut down PC and then press the Eject button to remove the CD/DVD. Could any body suggest How to Solve the problem Thanks & Regards Lokesh (HowTos)