Brightness problem


okay, think started happening after updating 10.6.8. whenever take break laptop, put brightness 0 , leave laptop 'sleep' without putting cover down. however, brightness turns automatically , have press 'lower brightness' make 0 again. why happen? , know how fix? wasting battery.
 

you may have brightness set auto adjust different light conditions.

system preferences > display > untick "automatically adjust brightness" :d
 


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