Yet another wrinkle in USB charging. I can charge my PRS-600 from the computer, while the computer is on, using the USB charging cable. BUT, I tried it with that same cable plugged into the USB power port on my laptop charger (it has a USB power-only port on the powersupply), it will not charge. I also tried charging using a USB-mini wall wart charger that came with my blackberry. Nothing.
Shouldn't USB power be the same, whether it comes from the computer or some dedicated USB charger? Does anyone know now the PRS-600 knows what it's plugged into, and only lets me charge it from the PC?