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XPS M1330 screen won't undim

I recently upgraded my Dell XPS M1330 to Windows 7 Professional 64-bit. I upgraded from Windows Vista Home. Everything works well except one problem. When my screen dims after a couple minutes, it won't undim without either adjusting the power cord or making the computer sleep and then waking it up. I've updated most drivers, but the Intel Driver for the GM965 Express Chipset says it's not compatible with the operating system. Any help?
 
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