We Penguins get the fan-in-supposed-sleep too. It’s really vexing me. EDIT: And there’s no bloomin’ indicator on the outside of the case, so one cannot tell when the thing is asleep (except in that, if the fans come on, you know that it isn’t). Further EDIT: There may well be a solution (of sorts) for, at least, Linux Mint. See here. I am afraid that that will not help you, @obfuscurity (and that’s a great username, by way!).