I have reinstalled Windows 7 on my Dell Precision M4600. I installed the chipset (restarted), then video and network driver (in that order). However I am not able to dim the light using fn-up/down.
I installed the drivers first without any Windows update. Using the control point software, I got the little dialog showing the dimming. However after updating the dialog displays but it is fixed; that is, nothing happens when I try to dim the screen. The keyboard dimming works.
I am having NVIDIA 1000 Quadro M graphic card if that is any help. Turning off Optimus in BIOS fixes the problem but I have never had this problem before reinstalling.
Best Answer
You're missing dell system software. Go to http://support.dell.com, choose one of the three options on screen, then click "Drivers & Downloads" or the like, then enter your service tag (found on the underside of your laptop), then you'll likely want to select "All files for ... " that's in about the middle of the screen, refine the search results it gives by selecting your OS, under the title of "System Utilities" you should see something similar to "Dell Feature Enhancement Pack". This is what you want to download and install.