Here's a cool tip to keep your PSP brightness set to Level 4--even when running on batteries...
Lock Your PSP At Brightness Level 4!
Posted by greg
qj has an interesting article posted with regard to locking your PSP at brightness level 4, without the a/c adaptor being plugged in at all times.
Below is the simple method used to accomplish this:
Plug your power cord.
Adjust your brightness to Level 4.
Start a UMD game/homebrew.
When the program launch video is being played (the one with green balls flashed and PSP text in the middle of the screen), make sure you unplug the power cord from the PSP when the launch sound effect is over. You will notice that the brightness didnt fall down to level 3.
Now your PSP will be locked at level 4 - even after you suspend/resume, or turn on/off the screen [by holding the brightness button].
Simply pressing the brightness button will reset the level.
Enjoy!
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