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 5 of 6 - 13 Comments

The Sandy Bridge notebook in use is the HP EliteBook used in many Phoronix tests with the Intel Core i5 2520M and the integrated Intel HD graphics. This CPU does support EPB and is indicated so by /proc/cpuinfo. On the latest Oneiric kernel, ENERGY_PERF_BIAS being set to "normal" is also indicated from the dmesg output. This Sandy Bridge system was running the latest Ubuntu Oneiric packages as of 7 October.

This testing is comparing the Linux 3.0 and 3.0.1 vanilla kernels to the latest kernel found in Oneiric (3.0.0-12-generic) and when PCI Express Active State Power Management is forced.

The battery power usage test profile does indicate the power usage going down in the 3.0.1 and Oneiric kernels by a small amount. Unfortunately, since Sandy Bridge is not well supported in the 2.6.38 and earlier kernels, there are not power consumption results that can be looked at going far back. When ASPM was forced, the power usage was at its lowest point, but there is not much of a difference due to the use of integrated graphics (rather than a discrete GPU that could use ASPM) and Sandy Bridge already being quite power efficient.

With OpenArena, the 3.0.1 and Oneiric kernels did drop by about one Watt on average for their power consumption while running this OpenArena game.

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. New build, first Linux PC, what could go wrong? ;)
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  5. Radeon related kernel bug??
  6. how the US intellegentia operates:
  7. AMD Publishes Open-Source Linux HSA Kernel Driver
  8. Next-Gen OpenGL To Be Announced Next Month