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

An Update On The Linux Power Situation In Ubuntu

Michael Larabel

Published on 7 October 2011
Written by Michael Larabel
Page 6 of 6 - 13 Comments

Fortunately, the EPB MSR being in its normal mode rather than performance mode on these newer kernels didn't affect the OpenArena frame-rate.

With the compute-intensive C-Ray benchmark, the power consumption is up by two Watts on 3.0.1 and Oneiric's current kernel, but drops by two Watts when forcing PCI-E ASPM.

If you were hoping that the PCI Express Active State Power Management situation would be fixed up by the time of the Ubuntu 11.10 release -- considering this issue has been around before the release of Ubuntu 11.04 -- it's not going to happen. Upstream developers have yet to set the ASPM bits directly in more drivers or otherwise figure out how to be more like Windows in terms of how ASPM support is treated. For now, you need to make sure you set "pcie_aspm=force", if your hardware supports the mode. What Canonical's kernel team says is the "fix" to LP #760131 is an unrelated power fix done upstream to ensure that the MSR_IA32_ENERGY_PERF_BIAS register is set to "normal" rather than "performance" mode. The hardware in the original posting to the aforementioned bug report does not even support EPB and is about ASPM and other power changes causing the significantly higher power usage. As these latest tests from the Sandy Bridge notebook show, the 3.0.1+ kernels can improve the power efficiency without degrading the system performance, but will only help you if running the latest Intel hardware that supports the energy performance bias feature.

I'll have some more Linux power information coming soon...

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. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. LLVM 3.6 Will Be Branched Next Month
  2. Opera Browser Puts Out Linux Updates For The Holidays
  3. GNOME Shell 3.15.3 Adds Support For High-Contrast Themes
  4. Linux 3.19: ThinkPad Muting Redone, New Dell Backlight Support, Acer Is Banging
  5. KVM Drops Support For IA64 While Adding Various x86 Improvements
  6. GCC 4.8.4 Officially Released
  7. FSF's High Priority Project List Now Has A Committee
  8. Details On Using OpenACC & GPUs With GCC
  9. Ubuntu 15.04 Alpha 1 For Its Various Flavors
  10. Git 2.2.1 Released To Fix Critical Security Issue
Latest Forum Discussions
  1. XLennart: A Game For Systemd Haters With Nothing Better To Do
  2. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  3. Debian init discussion in Phoenix Wright format
  4. FPS capped on Linux (AMD fglrx drivers)
  5. Are there an app using HSA ?
  6. Bench specific mount point
  7. Tool for measuring FPS in games
  8. Need some hand holding with upgrading xserver