Linux has drivers for devices shutdown when not used and idle powerstates, pretty much like Windows has. Android, who is Linux derived,took this concept to a much higher level.Think of a wireless card and you can see on man ath(4): " The driverdoes not fully enable power-save operation of the chip; consequentlypower use is suboptimal." This is one of the simplest example.
I configured a very stripped down linux kernel and it idles at about the same watt usage as OpenBSD.
I guess it's a matter of figuring out which drivers or kernel features are saving so much power.
I flashed my bios to the newest one they provide and Linux uses even less power; I did not see much difference on OpenBSD.
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