AC Charging became USB charging

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http://forum.xda-developers.com – Not sure if anyone of you experienced this problem before. It occurred to me that my charging from socket is so much slower than normal, thus I downloaded current widget to check the current that is charging, and it turns out that it is charging at USB speed, and in my Battery information in Settings, it is displayed as USB charging instead of AC charging. However when I unplugged my phone and plugged it back again, it became AC charging, and the current is back to normal at 999mA. (HowTos)