After installing win 8.1, couldn't adjust monitor brightness. It's driving me crazy. I tried to update the driver: system informed me that it was already up to date. But, there was still no brightness adjustment offered. Tried to use the manual control on the monitor, but it wouldn't change per the request I made. It is a ViewSonic VA930m and uses the AMD Radeon HD 7310 Graphics adapter for whatever that's worth. Help PLEASE!
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