On Thursday, 22 March 2007 14:44, Scott E. Preece wrote: > > | From: "Rafael J. Wysocki" <rjw@xxxxxxx> > | > | On Wednesday, 21 March 2007 23:57, Pavel Machek wrote: > | > Hi! > | > > | > > > Which is very much an indication of how weak ACPI is. It > | > > > doesn't contemplate typical SOC behavior, which have a wide > | > > > variety of system sleep states that leave the CPU on ... and > | > > > which may not even *have* (or need!) a "cpu off" state. > | > > > > | > > > My own definition would be more like: the minimal RAM-based > | > > > power-saving system state is "standby". If the system > | > > > implements a deeper RAM-based system sleep state, that's "STR". > | > > > | > > Hmmm, this leaves the decision how to call each state COMPLETELY to the > | > > implementor, doesn't it? > | > > | > Is that a problem? If someone is clever enough to implement suspend, I > | > think we can trust them to name their states right. > | > > | > (And trust me, we can flame them if not). > | > > | > (Anyway, my definition would be "mem" == RAM is powered, everything > | > else is down, except for devices needed for wakeup; "standby" == > | > something is powered that can be powered down, we'll fix that in next version). > | > | I think we can define "standby" a bit more precisely. Something like: > | - processes are frozen, > | - devices are suspended, > | - nonboot CPUs are down (and in low powered states, if possible), > | - "system" devices may or may not be suspended, depending on the platform, > | - the boot CPU may or may not be in a low power state, depending on the platform, > | - RAM is powered > | - wake up need not be BIOS-driven (main difference from "mem") > --- > > I would be tempted to say that that last bullet is the distinguishing > characteristic - that you come back from standby by just continuing > where you left off, but you come back from StR by something akin to > booting. Yes, that's what I meant. Greetings, Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
