Vyas,
you can check if you have the dcdbas kernel module loaded by issuing: 'sudo 
lsmod | grep dcdbas' in a terminal without the ticks.
To load the dcdbas kernel module, issue 'sudo modprobe dcdbas'
You might need to restart hal after loading the kernel module to get the 
backlight working. 
This can be done by typing 'sudo /etc/init.d/hal restart'

-- 
Dell Laptops don't talk to HAL about brightness correctly
https://bugs.launchpad.net/bugs/43572
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