Charge wont work on computer USB topic

Ok so my TF701 will charge just fine while connected to the wall charger, but it wont charge at all while connected to a computer. The instruction manual says it will and the general population of users agrees. However when I plug it into my computer the tablet still shows as discharging.

Yes the USB ports work fine. Tried in 4 different computers, nothing.

Anyone have any idea what is wrong?