Screen dimming delay . . .

I upgraded my iPhone 3G to 4.0.1 (quick and painless unlike the 4.0 release which was 9+ hours) last night and have noticed this morning that the time it takes for the screen to dim (before eventually turning off) after a period of inactivity has dramatically reduced. I can't remember the time that it took before as it was quite a lengthy delay, but now I reckon it's a period of approx 40 seconds before the screen dims. I think it used to be a couple of minutes. Has anyone else noticed this? Also is there any way to alter this timing (just like a MBP or iMac display in the Energy Saver System Pref Pane).
As always, any advice appreciated.

Neil was correct - auto-lock controls how long before the screen dims, followed shortly after by the phone locking. Passcode lock is a separate function. If you set auto-lock to never your screen won't dim. I suspect it's set to 1 minute at present =0)

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