Linux 3.15 Squeezes In More ACPI / PM Improvements
Written by Michael Larabel in Hardware on 2 April 2014 at 03:25 AM EDT. Add A Comment
Besides suspend and resuming much quicker, the Linux 3.15 kernel also has many other ACPI and power management improvements.

A week and a half ago the ACPI/PM 3.15 pull request was sent in by Rafael Wysocki when it looked like Linux 3.14 would be released and this Intel developer had to go off to the Linux Foundation Collaboration Summit. Rather than releasing Linux 3.14, Linus Torvalds ended up releasing 3.14-rc8 that week, and thus the ACPI/PM updates became stale. With Linux 3.14 finally now out there, Wysocki has re-sent in his ACPI/PM subsystem updates for the Linux 3.15 merge window. Besides including the original work, there's also a few more fixes that matured over the extra week within linux-next and are now ready for mainline integration.

Besides the faster suspend/resume support due to the kernel code using more asynchronous callbacks, there's a lot of other ACPI/PM improvements. Other noteworthy changes include device PM QoS support, updates to ACPICA, Windows 2013 has been added to the list of features for ACPICA to workaround some faulty hardware, battery / AC fixes, new device IDs, Intel RAPL clean-ups, Intel P-State fixes, CPUfreq / CPUidle fixes, and other fan / thermal optimizations.

More details on the Linux 3.15 ACPI/PM updates can be found via the new pull request.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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