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 Benchmarking Platform
Phoromatic Test Orchestration

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 News
  1. Fedora 22 Is Being Released Next Tuesday
  2. OpenWRT 15.05 Preparing Improved Security & Better Networking
  3. Using The New LLVM/Clang OpenMP Support
  4. Zapcc Claims To Be A "Much Faster C++ Compiler"
  5. Godot 1.1 Engine Release Brings New 2D Engine
  6. Intel VA-API Driver 1.6 Is Coming
  7. Canonical Is Reportedly Considering An IPO
  8. GNOME 3.18 - GTK3 Now Supports RandR 1.5
  9. Fedora 22 Risks Being Delayed Beyond Next Week
  10. Systemd 220 Has Finally Been Released
  11. LibreOffice 5.0 Beta 1 Released
  12. Allwinner Publishes New CedarX Open-Source Code
Latest Articles & Reviews
  1. Btrfs RAID 0/1 Benchmarks On The Linux 4.1 Kernel
  2. The State Of Various Firefox Features
  3. Intel Iris Graphics Performance With Mesa 10.6
  4. Fedora Workstation 22 Is Looking Great, Running Fantastic
Most Viewed News This Week
  1. The Linux 4.0 Kernel Currently Has An EXT4 Corruption Issue
  2. AMDGPU Open-Source Driver Code Continues Maturing
  3. Oculus Rift Suspends Linux Development To Focus On Windows
  4. Microsoft Open-Sources The Windows Communication Foundation
  5. LibreOffice 5.0 Open-Source Office Suite Has Been Branched
  6. Another HTTPS Vulnerability Rattles The Internet
  7. Wayland / Weston 1.8 Release Candidate Arrives
  8. Linux 4.1-rc4 Kernel Arrives A Day Late