Hello, On Mon, 3 May 2010, Mark Brown wrote: > I fully agree with this. We do need to ensure that a runtime PM based > system can suspend the CPU core and RAM as well as system suspend can > but that seems doable. It is already possible on OMAP-based systems running mainline Linux[1]. Consumer-market Linux devices that do this have been available since at least 2007[2]. Intel is pursing a similar approach with Moorestown[3], since "echo mem > /sys/power/state" is much more inflexible than an idle-loop-based system "suspend." Going forward, ACPI-style centralized power management is dead. Like "echo mem > /sys/power/state", ACPI PM is too inflexible for most use-cases, and so wastes power because the system must be kept in a higher-power state than necessary. Even Intel is abandoning ACPI[4]. - Paul 1. Paul Walmsley E-mail to the linux-pm mailing list, dated Fri May 14 10:22:05 PDT 2010: https://lists.linux-foundation.org/pipermail/linux-pm/2010-May/025530.html 2. http://en.wikipedia.org/wiki/Nokia_N800 3. German Monroy's presentation at ELC 2010, "Wake-ups Effect on Idle Power for Intel's Moorestown MID and Smartphone Platform": http://elinux.org/images/0/07/Effect_of_wakeups_on_Moorestown_power.pdf 4. Jacob Pan's presentation at ELC 2010, "Porting the Linux Kernel to x86 MID Platforms": http://elinux.org/images/e/ee/Jacob-Pan-x86MID-elc2010.pdf _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
