Gregory writes that he plugged in his 63% iPad into his Lenovo T61, where it reported itself to be "Not charging." Several hours later, the iPad reported an 87% battery level. As I've been plugging directly into A/C power or using a dedicated onboard port on one of my desktop because of those reports, I decided to give Gregory's suggestion a real world try.
Last night, I plugged in my 83% iPad into one of my USB hubs. The unit reported "Not charging", as expected. Regardless, I left it plugged in and revisited it this morning. Sure enough, my battery was completely 100% charged. As Gregory wrote in his letter, "Maybe when it says it's not charging it is just charging slower due to less voltage or something, but it is actually charging!"
It worked for me. Results may not be typical, so make sure to chime in below in the comments to let us know if it worked for you too.