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Enabling Brightness control on Radeon HD 3400

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Hi Guys, am using one of Dong's RadeonHD kext which got me full resolution of 1600x900...but now even if am running on batteries,i can't dim my screen to minimize battery usage..any way to get this enables :blink:

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I found one version of radeon hd that allows screen to turn off, but not dim, and allows machine to sleep. still no brightness controls though... pm me if you want it

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