I've always had issues with this card and the brightness controls after driver updates. However, up until now a registry hack has resolved the issue.
Basically - each time the driver is updated, the brightness control stops working. The keys move the slider, but no change in brightness occurs.
(Actually, this time it was a total nightmare - the update blue-screened my laptop and I had to uninstall everything (including the Intel card) and start all again)
I've tried the registry hack, but the key (KMD_EnableBrightnessinterface2) is no longer there. Creating it doesn't help.
I've tried disabling adaptive brightness etc, but again nothing.
Hoping you guys have had some more luck...
Windows 7 64-bit, Samsung Series 7 Chronos laptop.