this post was submitted on 12 Nov 2023
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It's software. I'm pretty sure my linux desktop can do this... It's not a special feature, exactly, the system state gets saved to RAM, and then the CPU goes to sleep.
On resume the kernel reads the state from RAM and puts everything back where it was and things continue from the exact same point from which they were suspended. Theoretically.
It's a complex sequence, and windows sleep is famous for getting it wrong on lots of hardware configs. I've had trouble with it on linux, as well, almost always relating to the GPU.
Valve very likely put in some work to have it work as well as it does on SteamDeck, but theres no reason it couldn't work on any given device.