[DLCPhoto]

From a previous thread:

I've run into this before, and haven't figured out exactly what triggers this, but this is how to fix it.

First set the time to what you want (1 minute, or whatever). Then go into your Registry:

HKCU\Control Panel\Backlight\LockLevel\LockLevel - the dWord there should be 0. I've found it set to 1 or 2, for no apparent reason.

This still happens to me periodically, and I've had my TP2 for over a year. Very frustrating, but at least it's easily fixed.

See if this works for you.