On Monday 16 February 2009, Alan Stern wrote: > On Mon, 16 Feb 2009, Rafael J. Wysocki wrote: > > > OK, so I think there are two things that user space may be allowed to do as > > far as putting devices into low power states is concerned: > > * disable/enable the automatic power management of the device (provided that > > the driver supports the automatic PM) > > Set the automatic PM parameters (idle timeout, state to go to, etc.). Yes. I'm not sure about the state part, though. > And disabling automatic PM altogether (effectively the same as setting > the idle timeout to infinity). Yes. > > * check what power states devices are in. > > What about situations where we want to distinguish between the power > state of the device itself and the power state of the link? For a disk > drive we may want to power the link on and off quite a lot, as that > has low latency, but spinning the disk up and down takes a long time > and so should have a longer idle-time value. Well, I'm not sure at the moment. Do you have any suggestions? Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
