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/sys/power/statehas no equivalent under/proc. Don't know what the rule is for what stuff goes where./sys/power/statehas no equivalent under/proc". You're probably right.procfsis sufficiently arcane to me that I'm not currently confident drawing that sort of conclusion myself. So, it might be pretty clear to you, but not to me. And therefore maybe not so clear to other people at a similar level of understanding to me. Hence the value in posting the question here - the answers might help me and them alike :)sysfsexposes a strict subset of the information exposed byprocfsrequires either exhaustive knowledge ofsysfs& substantial knowledge ofprocfs(the docs aren't exhaustive), or else knowledge of at least one datum insysfsdefinitely not present inprocfs. Tom Hunt suggested/sys/power/stateas a possible example of the latter. Another (true on my system) is/sys/block/sda/device/model. I'll expand this info in an answer.