Screen doesn't dim when it is about to turn off

[airtas]

So on all my other android phones the screen would dim about 2/3rds into the display timeout.

So if time out was 30 seconds it would dim at around 18 seconds and then turn off at 30.

On the Razr it does dim but very...very....very....very little.

Is this a software design, glitch, etc?

Also, should I be using the setting under display options about dimming the screen (this doesn't seem to change the display much)