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### Thinkpad power supply type detection (and how to fool it) ### The Thinkpad W530 detects the type of attached power supply by measuring the resistance between the power supply's ground (outter ring) and the 'detection' pin (central pin). Typical values are: 65W = ? ohm 90W = open (infinite resistance) 135W = 0 ohm (shorted) 170W = 1.5 Kohm This means that you may fool the W530 into believing it is connected to, say, a 135W power supply while the supply is of another type - just by shorting the outter ring and the central pin.