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MacBook Pro 17" 2009 Jerky Brightness Control

Joined
Mar 21, 2011
Messages
168
Motherboard
HP ProBook 4530s, MacBook Pro 8,1 13", MacBook Air 5,2 13", MacBook Pro 8,2 15", MacBook Pro 5,2 17"
CPU
i3-2310M, i7-2640M, i5-3427U, i7-2860QM, Core 2 Duo T9800
Graphics
HD 3000, HD 4000, AMD Radeon HD 6770M, GeForce 9400M, GeForce 9600M GT
Mac
MacBook Air, MacBook Pro
Classic Mac
Mobile Phone
iOS, Other
I recently bought 2009 17" MacBook Pro but i noticed that it doesn't change screen brightness smoothly as my 2011 MacBook Air does or even my old 2009 13" MacBook Pro, it's all jerky, it just jumps from one value to the next, when moving the slider in sys preferences it's all smooth but when doing it with F1/F2 it's all choppy, all my machines are running 10.8.4 so i don't think it's an OS issue. I would think it may be because it's an older machine but as i already stated my 13" 2009 MBP changes brightness smoothly but 17" doesn't.
Anyone familiar with this?
 
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