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

New Power Management Phases For Linux 3.4 Kernel

Linux Kernel

Published on 19 March 2012 11:02 PM EDT
Written by Michael Larabel in Linux Kernel
Comment On This Article

Just one day after the Linux 3.3 kernel was released, the power management pull request for the Linux 3.4 kernel has already been submitted.

Rafael J. Wysocki submitted the email pull request with the power management changes for the 3.4 kernel. Key items include the introduction of early/late suspend/hibernation device call-backs, generic PM domains extensions and fixes, devfreq updates, device PM QoS updates, concurrency problem fixes, and system suspend and hibernation fixes.

There isn't anything too exciting about this pull request, but of the 3.4 power management work, the most interesting item is arguably the "early/late suspend/hibernation device call-backs." This work comes down to "late suspend" and "early resume" phases for Linux device power management. These are optional call-backs for drivers to utilize after run-time power management is disabled and with device interrupts enabled. More details about this particular work can be found from the original mailing list thread when this work was initially published last December.

While not part of the main Linux power management pull, also announced to the kernel mailing list today was the AVS class of drivers. From the mailing list announcement, "AVS is a power management technique which controls the operating voltage of a device in order to optimize (i.e. reduce) its power consumption. The voltage is adapted depending on static factors (chip manufacturing process) and dynamic factors (temperature depending performance). AVS is also called SmartReflex on OMAP devices."

Previously there's been a OMAP2 SmartReflex power driver living elsewhere, but with this patch-set it ends up creating an AVS framework within the Linux kernel. At this time, only the Texas Instruments OMAP2/OMAP3+ hardware with the SmartRefle code is taking advantage of AVS in the Linux kernel.

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 Linux Hardware Reviews
  1. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  2. Intel Pentium G3258 On Linux
  3. SilverStone Precision PS10
  4. ASRock Z97 Extreme6
Latest Linux Articles
  1. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  2. KVM Benchmarks On Ubuntu 14.10
  3. X.Org Server 1.16 Officially Released With Terrific Features
  4. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
Latest Linux News
  1. A New Video Has Us Real Excited About The New UT For Linux
  2. CoreOS Experiences Its First Stable Release
  3. GNOME 3.13.4 Continues Working On Wayland & More
  4. Wine 1.7.23 Has Initial Support For 64-bit Android Builds
  5. FreeBSD Developing A New Automounter, Other Features
  6. Guix 0.7 Can Now Install The GNU Operating System
  7. X.Org Foundation Still Works Towards Becoming An SPI Project
  8. Open-Source AMD Hawaii Support Should Now Be Working!
  9. KDE Developers Continue Working Toward Wayland Support
  10. Ubuntu 14.04.1 LTS Released
Latest Forum Discussions
  1. Debian + radeonsi
  2. Open-source drivers on ATI R7 260X
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. New build, first Linux PC, what could go wrong? ;)
  5. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  6. Radeon related kernel bug??
  7. how the US intellegentia operates:
  8. AMD Publishes Open-Source Linux HSA Kernel Driver