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

More Linux Kernel Patches To Mimic Windows

Linux Kernel

Published on 11 November 2011 12:19 PM EST
Written by Michael Larabel in Linux Kernel
24 Comments

A day after Red Hat's Matthew Garrett published a Linux kernel patch to solve the ASPM power regression by more closely mimicking the Active State Power Management behavior of Microsoft Windows, he's published more Linux patches to mimic the Windows power management.

The PCI-E ASPM patch that went out yesterday and was written about on Phoronix over the night has addressed the ASPM issue on all hardware I have tested so far. It changes when ASPM is enabled/disabled, so that this PCI Express power management feature should be restored on most hardware like it was in pre-2.6.38 kernels while being switched off for problematic hardware.

There's multiple patches coming out today from Matthew Garrett. What these patches are doing are extending the blacklisting of individual drivers from having ASPM flipped on for their devices. Some drivers (e.g. the e1000 network driver) have already switched off the ASPM where the PCI-E v1.1 feature is known to not work, but these patches is doing it for just more drivers.

Matthew went through popular Microsoft Windows drivers to see what PCI-E drivers there had disabled the ASPM support. Within the Windows INF driver file there is a line that states whether ASPM works, so he's just mirroring that for the Linux drivers.

The patch series begins here on the Linux kernel mailing list. The ASPM device blacklisting from the patches published so far today include.

- Atheros: "ASPM is disabled on l1c, l2c, l2cb and l2cb2 devices except for those in Toshiba or Lenovo devices."
- JME / J-Micron Ethernet: 250 and 260 series devices don't play well with ASPM.
- CCISS: ASPM is disabled on all HP Smart Array hardware RAID controllers.
- HSPA: Disable ASPM support in this driver for HP Smart Array devices.
- Infiniband/NES: ASPM doesn't work.
- Atheros AR8113: ASPM is disabled on all L1E hardware.

It's just too bad it took so many months until getting to the bottom of the Linux Active State Power Management situation, especially when these simple patches today are just mirroring information that's publicly available from the Microsoft Windows drivers.

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. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  2. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
  3. AMD Radeon R9 285 Tonga Performance On Linux
  4. Apotop Wi-Copy
Latest Linux Articles
  1. AMD Moves Forward With Unified Linux Driver Strategy, New Kernel Driver
  2. MSI: Update Your BIOS From The Linux Desktop
  3. NVIDIA vs. AMD 2D Linux Drivers: Catalyst Is Getting Quite Good At 2D
  4. 15-Way GPU Comparison With Mesa 10.3 + Linux 3.17
Latest Linux News
  1. Linux 3.18-rc1 Released One Week Early With Many Changes
  2. The VC4 Gallium3D Driver Is Still Moving Along For The Raspberry Pi
  3. Direct3D 9 Support Might Land Within Mainline Mesa 3D Drivers
  4. OpenGL Preview Benchmarks For NVIDIA's GeForce GTX 970
  5. HOPE: The Ease Of Python With The Speed Of C++
  6. Vitesse: Using LLVM To Speed Up Databases
  7. AMD Is Restructuring Again, Losing 7% Of Employees
  8. Linux Testing Of The NVIDIA GeForce GTX 970
  9. Qt 5.4 Now In Beta With Web, Bluetooth LE, Graphics Improvements
  10. AMD's Radeon R9 285 On Linux Offers Good OpenCL Performance
Latest Forum Discussions
  1. NVIDIA Presents Its Driver Plans To Support Mir/Wayland & KMS On Linux
  2. AMD Is Restructuring Again, Losing 7% Of Employees
  3. Bye bye BSD, Hello Linux: A Sys Admin's Story
  4. Open-Source AMD Fusion E-350 Support Takes A Dive
  5. Upgrade to Kaveri, very slow VDPAU performance
  6. ChromeOS Drops Support For EXT2/EXT3/EXT4 File-Systems
  7. Lennart Poettering On The Open-Source Community: A Sick Place To Be In
  8. The Slides Announcing The New "AMDGPU" Kernel Driver