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Cannot change brightness with AMD 15.8 beta driver (system with intel HD 3000 + AMD hd 6770M) and black screen issue after clean install

Question asked by anhtu96 on Sep 4, 2015

After updating to 15.8 driver, the black screen issue was fixed but the brightness is always at lowest level and I cannot change it.After completely removing amd driver and re-installing it, the screen brightness is normal again, however, the black screen issue appears... Please fix it