I recently put some iPads up around my office building as conferance room markers. They're plugged in to USB outlets, and seem to be charging fine. The screen stays on all the time, running Eventboard Pro.
The problem is that in order to keep the battery from running down while plugged in, I adjust the screen brightness to around 75%. But, whenever I come back to them later in the day, they brightness slider is back at 100%, causing the battery to drain. Usually when I arrive in the morning I have to go around the building, manually turning on and lowering the brightness. Autobrightness is turned off on all of them, and I'm pretty sure the outlets are fine, as it charges during the day with lowered brightness.
Is this auto-adjustment in brightness a known issue, or is there some hidden setting I'm missing? The iPads are all updated to the most recent iOS as of April 1st, and it's a mix of iPad 2s and New iPads.
If I need to provide any other information, I'll be happy to do so. Thanks for looking!