C2 USB Power ECR

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The power limitation on USB power is currently 5W on production (XO-1 C2) laptops.

Increasing USB power to 7.5W

To increase the maximum power draw to 7.5W, replace R281 with a 140K, 1%, SMD0402 resistor. Please note that this decreases the maximum ambient temp. rating, and increases the total power dissipation of the laptop. A laptop supplying 7.5W to the USB should always have a battery present. If this power is going to be drawn from a single USB socket, it should be from one of the two sockets nearest the power button.