I have a Nvidia driver for my desktop computer. In 12.04 and all previous versions it would first start to dim and then switch to the off state if I didn't move the mouse for 10 min or so. Since the upgrade to 12.10 there is no longer any hint that it is about to turn off, but rather it goes from 100% to 0% instantly.
Maybe some setting got screwed up in the update? If so, where is it?