On Thu, 27 Apr 2006, Patrick Mochel wrote: > > According to David this shouldn't matter. During swsusp the system is > > supposed to be completely off, with no suspend power available. Hence all > > the power sessions are guaranteed to be interrupted, and the boot kernel > > doesn't have to worry about destroying any of them. > > Not necessarily. x86 hardware implementations of suspend-to-disk retain some > power during suspend. Not many (if any) devices will retain context, but the > system is definitely not completely "off". Actually, the same is true for > soft-off on x86 (aka ACPI S5). Some power may be drawn to support various power > on events. The only time a system is truly off is when it is unplugged from > the wall (and/or the battery taken out, if applicable). > > I don't think it matters much in this particular context, but it's important > to keep in mind when making assumptions about "off-ness". I'm perfectly happy to let you duke this out with David! :-) Either way, there is one important observation: You can't use swsusp if your root filesystem is on a USB disk. Not until some sort of persistent storage manager is available... Alan Stern
