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. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  2. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  3. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  4. AMD Radeon R9 285 Tonga Performance On Linux
Latest Linux Articles
  1. Btrfs RAID HDD Testing On Ubuntu Linux 14.10
  2. Ubuntu 14.10 Linux 32-bit vs. 64-bit Performance
  3. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  4. MSI: Update Your BIOS From The Linux Desktop
Latest Linux News
  1. Nouveau Now Supports DRI3 Without GLAMOR
  2. Features Of The Linux 3.18 Kernel
  3. Debian Now Defaults To Xfce On Non-x86 Desktops
  4. Phoenix Is Trying To Be An Open Version Of Apple's Swift
  5. Linux 3.19 To Have Skylake Graphics, PPGTT Enablement
  6. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  7. Imagination Releases Full ISA Documentation For PowerVR Rogue GPUs
  8. Features GNOME Developers Want In The Linux Kernel
  9. GTK+ Gains Experimental Overlay Scrollbars
  10. Phoronix Test Suite 5.4 M3 Is Another Hearty Update
Latest Forum Discussions
  1. Users/Developers Threatening Fork Of Debian GNU/Linux
  2. AMD Releases UVD Video Decode Support For R600 GPUs
  3. HOPE: The Ease Of Python With The Speed Of C++
  4. Proof that strlcpy is un-needed
  5. xbox one tv tuner
  6. Bye bye BSD, Hello Linux: A Sys Admin's Story
  7. Updated and Optimized Ubuntu Free Graphics Drivers
  8. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux