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.). And disabling automatic PM altogether (effectively the same as setting the idle timeout to infinity). > * 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. Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
