Screen is dim after software update

For the last day and a half, my MacBook screen won't go to full brightness. I have the power connected and I've rebooted and I'm using the screen, but it's still in "power save" or dim mode. It used to be that the screen would dim on battery power after a few minutes of not typing. Now it's just always dim.
The last thing I did before this happened was install some software updates that I was prompted to install. It says the System Version is Mac OS X 10.5.6 (9G66) but I'm not sure what all it upgraded Saturday night (there were like 12 downloads).
Maybe I can use Time Capsule to back out the upgrade and see if that helps, though the one time I tried to do that was a nightmare.....

You can't use the brightness key on the keyboard to increase brightness?
Also, try a SMC and PRAM reset. Shut down, unplug the magsafe, take out the battery, and hold down the power button for at least five seconds. Next, put everything back and start up holding command-option-p-r until it chimes twice. Then let it start up normally.

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