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. 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. Civilization: Beyond Earth Linux GPU/Driver Benchmarks
  2. X.Org Server 1.16.3 Released To Fix Security Issues
  3. Linux 3.19 Merge Window Closes Ahead Of Schedule
  4. MIPS R6 Architecture Now Supported By GCC
  5. LowRISC To Feature Tagged Memory & Minion Cores
  6. Intel Skylake Audio Support For Linux 3.19
  7. After 10+ Years, NetworkManager Reaches v1.0
  8. VDPAU Updated To v0.9
  9. An Open Hardware Random Number Generator Proposed
  10. LLVM 3.6 Will Be Branched Next Month
Latest Forum Discussions
  1. Need some hand holding with upgrading xserver
  2. Are there an app using HSA ?
  3. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  4. XLennart: A Game For Systemd Haters With Nothing Better To Do
  5. Updated and Optimized Ubuntu Free Graphics Drivers
  6. Debian init discussion in Phoenix Wright format
  7. FPS capped on Linux (AMD fglrx drivers)
  8. Bench specific mount point