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

Intel Driver Works On "PM Suspend Freeze" Support

Intel

Published on 28 January 2013 11:50 AM EST
Written by Michael Larabel in Intel
Comment On This Article

Zhang Rui of Intel is working on supporting the PM_SUSPEND_FREEZE power management suspend state for their open-source Linux graphics driver. This PM suspend state has some benefits over other current power states but also some shortcomings.

PM_SUSPEND_FREEZE doesn't depend upon any platform specific support but is a state whereby processes are frozen, devices suspended, and processors idled. PM_SUSPEND_FREEZE saves less power than PM_SUSPEND_MEMORY as the system is still in a running state, but it has shorter resume latency since it doesn't touch the BIOS and the processors are sitting in an idled state.

Compared to RTPM/idle, Zhang Rui says PM_SUSPEND_FREEZE has greater power savings as the processors have longer sleep time and the CPUs can drop into deeper C-states. PM_SUSPEND_FREEZE also uses the system suspend code path so there's greater power savings from hardware that lacks good RTPM support.

The PM suspend freeze state is characterized as good for platforms without (or broken) STR or where the hardware has an extremely low-power idle state.

More information and early tests on PM_SUSPEND_FREEZE when supported by the open-source Intel Linux graphics driver can be found on the intel-gfx mailing list. The initial results contain average power consumption results under different power management states as well as the average resume latency from these different states.

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. Even With Re-Clocking, Nouveau Remains Behind NVIDIA's Proprietary Linux Driver
  2. The Power Consumption & Efficiency Of Open-Source GPU Drivers
  3. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  4. Intel Pentium G3258 On Linux
Latest Linux Articles
  1. AMD Catalyst 14.6 Does Slightly Better With APITest OpenGL Tests
  2. Updated Source Engine Benchmarks On The Latest AMD/NVIDIA Linux Drivers
  3. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  4. KVM Benchmarks On Ubuntu 14.10
Latest Linux News
  1. Fedora Assembles A Security Team
  2. AMD Launches The A10-7800, The 65 Watt Kaveri
  3. Builder: A New Development IDE Being Built For GNOME
  4. GDB 7.8 Betters Python Scripting, Adds Guile Support
  5. GNOME's GTK+ Is Still Striving For A Scene Graph, Canvas API
  6. Unreal Tournament Looks Great For Team Deathmatch
  7. LibreOffice 4.3 Released With Many Exciting Changes
  8. GNOME/GTK On Wayland Gains Focus At GUADEC
  9. GNOME Stakeholders Take Issue With Groupon Over their Gnome
  10. GStreamer VA-API Plug-In Update Adds New Features
Latest Forum Discussions
  1. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  2. AMD Publishes Open-Source Linux HSA Kernel Driver
  3. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  4. Debian + radeonsi
  5. Open-source drivers on ATI R7 260X
  6. AMD Athlon 5350 APU On Linux
  7. Updated and Optimized Ubuntu Free Graphics Drivers
  8. List of Linux friendly Kickstarter projects