Some of you iPad users no doubt noticed that USB ports barely charged the iPad.
There is not enough current flowing thru a typical USB port to make the pad happy. You could tell by the notice in the upper right hand corner that stated - 'not charging'.
Motherboard manufacturers have released updates to boost the juice.
I use gigabyte boards and had great results with ON/OFF Charge.
GIGABYTE ON/OFF Charge
Asus has AI charger
ASUS Ai Charger - Quick charge your iPod, iPhone and even iPad! which many state works on most boards by various manufacturers.
Enjoy