Models with supporting EZ Charger may get chance to see the phenomenon with some specific USB keyboard/mouse connected to the USB EZ Charger ports. It means that with this scenario you may have the possibility unable to wake up the system from S3 or S5 state by the USB keyboard/mouse. This is because the USB EZ Charger ports provide 3 times current than general USB ports for consumer products like iPhone, iPad and iPod touch that need large amount of current for faster recharging within less time. To get rid of this, please attach the USB keyboard and mouse to the general USB ports to obtain the expected behavior.
- More information for EZ Charger,