Shortly after the Surface Book 2 started arriving in people's hands, an issue arose with how the 15-inch model handles power draw during heavy gaming. While operating on its highest performance mode, the system can draw more power than the included charger can supply while running particularly intense games under heavy load, leading to a situation where the battery is drained even when plugged in.
In a statement to The Verge, which spotted the problem with Destiny 2, Microsoft says that this behavior is intended. Says Microsoft:
With a Core i7 processor and NVIDIA GTX 1060 graphics, the Surface Book 2 is a powerful machine for its size. And while that enables it to power some high-end games at top quality, that also comes with considerable power draw; too much, as it turns out, for its included charger to supply. For anyone experiencing the issue, it's reassuring to know that it isn't the result of any defects, but it's still limiting.
Keep in mind that this appears to apply only to the 15-inch model, and under very heavy load. You can avoid battery drain with intensive games by stepping your resolution down or opting for lower graphics settings.
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