So, keep the stock driver, but add some other driver plus Windows register configuration that tells Windows how to do brightness at the hardware level?
Is that even possible within Windows? Or does it need to be built into the graphics driver itself?
(I'm specifically asking about Intel's "Legacy Backlight Brightness (LBB) I/O Register". Which works on a lot of Intel GPUs.)
For reference, I'm not really grokking all the jargon: http://msdn.microsoft.com/en-us/library/windows/hardware/ff569755(v=vs.85).aspx