I don't see anything resembling "backlight control." I've got these controls:
Display:
Contains H. Position, V. Position, Pixel Clock, Phase. All are disabled because I use DVI.
Picture:
Contains brightness, contrast, sharpness, color.
Picture advanced:
Contains a "picture mode" option which I just leave at "standard." The screen looks awful when it's set to anything else (Photo, Movie, and Dynamics).
PIP:
I've never used this.
System:
This lets me change the input, adjust OSD settings, and look at display information.
If you find yourself constantly adjusting your brightness/contrast, that is a sign that your LCD is not calibrated properly.
I haven't adjusted the brightness/contrast in more than two years until the image retention incident. And now it's back the way it was before.