My experience with various portable computing devices over the years is that they overheat and shutdown to protect themselves when used in direct sunlight combi

My experience with various portable computing devices over the years is that they overheat and shutdown to protect themselves when used in direct sunlight combined with warm to hot ambient air temperatures. I do not expect the manufacturers to overbuild the thermal capacity such that this isn't a problem, not when we're talking about portable devices which (appreciably) prioritize compactness and lightness. In the past I would have to shade my laptop while using it to play MP3s from the passenger seat with the convertible top down while on road trips through Nevada, to prevent if from overheating in the direct sunlight. It never crossed my mind that this was some kind of failure on IBM's part, the machine was already pushing the limits of what was possible at the time in the interests of being small and light.