1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

ACPI Support Continues To Be Improved In Linux

Hardware

Published on 23 January 2013 02:53 AM EST
Written by Michael Larabel in Hardware
2 Comments

There's a number of ACPI updates that are being shown off and will likely make their debut in the Linux 3.9 kernel for improving the power management support.

Support for the Advanced Configuration and Power Interface (ACPI) continues to see improvements with each succeeding Linux kernel release and it's getting into shape compared to Microsoft Windows' support for the device configuration and power management specification. The Linux kernel is also seeing less power regressions recently and power consumption levels under Linux are generally doing well compared to Windows.

In the past few days there's been a number of ACPI-patches being presented on the Linux kernel mailing list, most (if not all) should then appear in the Linux 3.9 kernel.

ACPI / PM: Export power states of ACPI devices via sysfs - Rafael Wysocki is making it possible for user-space scripts/applications to easily find out the current power state of a given device with ACPI power management through sysfs. "Make it possible to retrieve the current power state of a device with ACPI power management from user space via sysfs by adding a new attribute power_state to the sysfs directory associated with the struct acpi_device object representing the device's ACPI node."

ACPI / PM: Export power resources information to user space - This patch-set from Rafael builds upon the earlier mentioned patch, but for exposing more ACPI power resources to user-space, namely via sysfs.

acpi-cpufreq and powernow-k8 fixes - There's a set of six patches to take care of fixes for acpi-cpufreq and powernow-k8. What's worthy of being pointed out with these patches is they come from Borislav Petkov. Boris is a long-time Linux kernel developer who was responsible for much of AMD's Linux kernel contributions, but he was laid off last October when AMD got rid of some Linux kernel developers and closed their Operating System Research Center. While Petkov is no longer employed by AMD, he's still working on areas of the kernel that benefit the company. (Upon some research, it looks like he might now be employed by SUSE.)

ACPI / PM: Initial power state checking and power state setting changes - More power management work by Rafael. These four patches "make the determination of the initial device power state more robust and change the way ACPI device power states are changed to be more in line with the spec."

PCI, ACPI: pci root bus hotplug support / pci match_driver - Kernel improvements for hot-plugging and hot-remove are coming thanks to work by Yinghai Lu.

ACPI / PM: Fixes related to the D3cold power state - Two D3cold power state fixes.

These are just the notable ACPI / power management work that's been shown off in the past week on the Linux kernel mailing list.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Articles & Reviews
  1. Samsung 850 EVO SSD Linux Benchmarks
  2. Kubuntu 15.04 Is Turning Out Quite Nice, Good Way To Try Out The Latest KDE
  3. 5-Way Linux Distribution Comparison On The Core i3 NUC
  4. OCZ ARC 100 Linux SSD Benchmarks
  5. Lenovo ThinkPad X1 Carbon Works Great As A Linux Ultrabook
  6. Transcend SSD370 256GB
Latest Linux News
  1. OpenBSD Sponsors Work For Better Browser Security
  2. Improved ODF Reading Support Comes To KDE's Calligra
  3. Another Step Closer On The New Linux Benchmarking Test Farm
  4. Confirmed: Vulkan Is The Next-Gen Graphics API
  5. Kdenlive Ported To Qt5/KF5, Coming To KDE Applications 15.04
  6. HTC & Valve Partnered Up For The Steam VR Headset
  7. 8cc: A Small C11 Compiler
  8. Not Everyone Likes The Possible "VULKAN" Name For Next-Gen OpenGL
  9. The Binary Blobs Making Up Coreboot
  10. Linux 4.0 & LLVM vs. GCC Yielded Much Interest This Month
Most Viewed News This Week
  1. Screenshots Of The GNOME 3.16 Changes
  2. More Proof That Allwinner Is Violating The GPL
  3. The Tremendous Features Of Fedora 22
  4. Krita 2.9 Released, Their Biggest Release Ever
  5. A Single UEFI Executable With The Linux Kernel, Initrd & Command Line
  6. Linux 4.0 Doesn't Have The Weirdest Codename
  7. Canonical Comes Up With Its Own FUSE Filesystem For Linux Containers
  8. Firefox 36 Brings Full HTTP/2 Support
%%CLICK_URL_UNESC%%