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

Radeon Power Management Gets More Fixes For 3.11

AMD

Published on 17 July 2013 05:17 PM EDT
Written by Michael Larabel in AMD
43 Comments

Just days after the first release candidate of the Linux 3.11 kernel, additional user testing of the new Radeon dynamic power management support has revealed more bugs in the open-source driver. Fortunately, there's already another pull request for Linux 3.11 to take care of some more Radeon "DPM" issues.

Alex Deucher sent in a pull request (actually, two) today for better fixing up the Radeon dynamic power management support. There's already been multiple pull requests to address DPM fallout, but this latest round of issues resolved include:

- The radeon.aspm=0 kernel module parameter has been introduced for disabling ASPM support. PCI Express Active-State Power Management (PCI-E ASPM) was added for the open Radeon driver as part of the DPM changes, but for certain motherboards it will lead to hangs. For those that remember the ASPM power issues Phoronix uncovered in years prior, this shouldn't be a big surprise, but now if you're hitting hangs there is this workaround.

- An endian bug was corrected in the Atom table parsing code.

- There's a fix for the Atom-based vRAM table parsing to take care of some problems with certain Radeon GPUs when switching the memory clock speeds.

- Workarounds for GCC compiler bugs in the Radeon DPM Atom code.

- Debugfs support to read the RS780/RS880 dynamic power management information, similar to the other debugfs entries added for different Radeon GPUs.

For those that didn't see yesterday's article, depending upon the AMD Radeon hardware, DPM can really drive up the open-source Radeon graphics performance. For those not yet experimenting with the feature on the yet-to-be-released Linux 3.11 kernel, more tests are forthcoming for this code on Phoronix.

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. Btrfs On 4 x Intel SSDs In RAID 0/1/5/6/10
  2. AMD Radeon R9 290 On Ubuntu 14.10: RadeonSI Gallium3D vs. Catalyst
  3. MSI X99S SLI PLUS On Linux
  4. NVIDIA GeForce GTX 970 Offers Great Linux Performance
Latest Linux Articles
  1. Windows 8.1 vs. Ubuntu 14.10 With Intel HD Graphics
  2. 6-Way Ubuntu 14.10 Radeon Gallium3D vs. Catalyst Driver Comparison
  3. NVIDIA vs. Nouveau Drivers On Ubuntu 14.10
  4. Ubuntu 14.10 Offers AMD Radeon Driver Performance Improvements
Latest Linux News
  1. GTK+ 3.16's New GtkGLArea Widget Gets Improved
  2. X.Org Server 1.17 ABI Bumped
  3. Fedora 21 Beta To Be Released Next Week
  4. Go 1.4 Beta Release Brings Big Runtime Changes
  5. SIMD For JavaScript Continues Coming Along
  6. GNOME 3.15.1 Released
  7. Red Hat Software Collections 1.2 Adds GCC 4.9, Nginx 1.6
  8. GLAMOR Acceleration Continues To Be Cleaned Up
  9. Russia's Yandex Web Browser Finally Released For Linux
  10. Linux Kernel Finally Being Optimized For SSHDs
Latest Forum Discussions
  1. Is foolish currently develop in machine code, hexadecimal and assembly?
  2. Reducing The CPU Usage In Mesa To Improve Performance
  3. How to get rid of Linux
  4. Help diagnosing problems with a Readon HD 4670 on Mesa 10.3.2-1
  5. Advertisements On Phoronix
  6. nv and xorg.conf under Debian PPC
  7. Looking for a Open-Source AMD experienced Linux mentor
  8. Bad perfomance in gaming