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

Ubuntu 11.10 Beta Has No Power Regression Fix

Ubuntu

Published on 01 September 2011 10:02 AM EDT
Written by Michael Larabel in Ubuntu
11 Comments

Canonical's Kate Stewart set a milestone for correcting the ASPM power issue by Ubuntu 11.10 Beta 1. Ubuntu 11.10 Beta will be released today, but it will not fix the Linux 2.6.38 power regression that's caused by a change in PCI-E Active State Power Management.

A month ago I wrote, "A few hours ago, Kate Stewart marked LP bug #760131 as being a milestone candidate for Ubuntu 11.10 Beta 1. This bug is for the main power regression introduced in the Linux 2.6.38 kernel as caused by PCI Express Active-State Power Management changes. There hasn't been a "solution" upstream in either the Linux 3.0 or 3.1 kernels yet since this is a tough problem. I'm not sure what Canonical is planning to do to "fix" the situation (considering their overall lack of low-level technical contributions particularly in the kernel area) besides possibly forcing PCI-E ASPM or just postponing the fix to a later milestone."

Sure enough, a fix has been delayed. Martin Pitt has changed the milestone target for triaging from Ubuntu 11.10 Beta 1 to Ubuntu 11.10 Beta 2. That's still extremely optimistic. The second beta is due out on the 22nd of September, but still it's unlikely to see a PCI Express ASPM change within Ubuntu 11.10. The 15th of September also marks the kernel freeze for Ubuntu 11.10, so unless they come up with some sort of workaround (such as forcing PCI-E ASPM on my default, but that could crash some systems), there won't be any fixes for the Oneiric Ocelot release.

Heck, we'll only likely see a real fix in Ubuntu 12.04 LTS if the upstream kernel developers address the problem by coming up with a new way to more accurately determine when PCI Express Active-State Power Management is supported or not. This likely will come down to testing hardware/driver combinations and having each driver set the ASPM supported bit flag when it's known to work safely, since many system BIOSes aren't advertising their ASPM support when in fact the system can handle this power management feature.

There's no real improvement with the Linux 3.1 kernel and I haven't seen anything queuing up yet for the Linux 3.2 kernel. In fact, with Intel graphics the power consumption can go up in Linux 3.1. There's also other Linux power management regressions still outstanding.

The tracking of the ASPM power management regression can be done via LaunchPad Bug #760131, "Power consumption raised significantly in natty."

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. Updated Source Engine Benchmarks On The Latest AMD/NVIDIA Linux Drivers
  2. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  3. KVM Benchmarks On Ubuntu 14.10
  4. X.Org Server 1.16 Officially Released With Terrific Features
Latest Linux News
  1. GNOME's GTK+ Is Still Striving For A Scene Graph, Canvas API
  2. Unreal Tournament Looks Great For Team Deathmatch
  3. LibreOffice 4.3 Released With Many Exciting Changes
  4. GNOME/GTK On Wayland Gains Focus At GUADEC
  5. GNOME Stakeholders Take Issue With Groupon Over their Gnome
  6. GStreamer VA-API Plug-In Update Adds New Features
  7. Qt 5.4 Going Into Feature Freeze Next Week With Exciting Changes
  8. OpenSUSE Factory Turns Into Rolling Release Distribution
  9. "The World's Most Highly-Assured OS" Kernel Open-Sourced
  10. NVIDIA Is Working Towards VDPAU H.265/HEVC Support
Latest Forum Discussions
  1. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  2. Open-source drivers on ATI R7 260X
  3. AMD Athlon 5350 APU On Linux
  4. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  5. Updated and Optimized Ubuntu Free Graphics Drivers
  6. Debian + radeonsi
  7. List of Linux friendly Kickstarter projects
  8. Porting Mesa to the Playstation 2