On Mon, 21 Mar 2005, Arioch wrote: > AS: where it counts, by hibernate i mean Suspend-to-disk, not > suspend-to-RAM. > > I wonder, if hardware configuration asked for changes when resuming from > hibernate ? > > I have a notebook with USB1 keyboard-and-hub (Cherry) and an USB2 Flash > drive. > > Keyboard reports it can give 100 mA of current per-port. > USB disk reports it consumes 200 mA. > > So de jure this disk is not to be turned on, or at least Linux is to ask > user if he wants to run this device, even he understands it is risky. > Ok, this question is not for Power-Management forum. > > But i remember a couple of pitfalls i met on Windows and do not want to > see them in Linux. > > When i plug this USB dirve into keyboard when Win2003 is running, > Windows rejects the device since it requests too much power. > But if i put Windows to hibernate, then plug the USB Drive and then > resume Windows - it forgets to check for power requirements and tunrs > device on (which is useful, but which is a bug :-) ) > > So i wonder if there are (planned) some measures to test for hardware > changes, why PC was hibernated. This specific case -- plugging in a new USB device while the system is asleep -- will be handled correctly. In fact, it will be handled exactly the same as if you had plugged in the device after waking up the system. Alan Stern
