Macbook LCD Backlight Flicker


at low brightness levels (1-5 brightness bars on on-screen hud), backlight on c2d macbook's lcd appears flicker intermittently. it's screen jumps high brightness level split seconds @ time in "spasms" lasting maybe 5-10 seconds. happens without apparentl immediate cause , doesn't happen (i.e., doesn't happen or happen every time drop brightness).

known issue? apple address since don't know how reproduce , don't know precisely what's directly causing it?
 



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