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. AMD Launches New FX CPUs, Cuts Prices On Existing Processors
  2. Preview: AMD's FX-9590 Eight-Core At Up To 5.0GHz On Linux
  3. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  4. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
Latest Linux Articles
  1. Ondemand vs. Performance CPU Governing For AMD FX CPUs On Linux 3.17
  2. How Intel Graphics On Linux Compare To Open-Source AMD/NVIDIA Drivers
  3. The Fastest NVIDIA GPUs For Open-Source Nouveau With Steam Linux Gaming
  4. Testing For The Latest Linux Kernel Power Regression
Latest Linux News
  1. New Group Calls For Boycotting Systemd
  2. The Features To Find With The Imminent Release Of LLVM/Clang 3.5
  3. Borderlands 2 Is Coming To Linux
  4. The Witcher 2 Ups The Performance More & Works Around Catalyst Bug
  5. Running Gallium3D's LLVMpipe On The Eight-Core 5GHz CPU
  6. Trying Intel OpenCL On Linux For Video Encoding
  7. GSoC 2014 Yielded Some Improvements For Mesa/X.Org This Year
  8. webOS Lives On As LuneOS With New Release
  9. Marek Lands Radeon Gallium3D HyperZ Improvements
  10. Mozilla Firefox 32 Surfaces With HTML5, Developer Changes
Latest Forum Discussions
  1. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  2. nv and xorg.conf under Debian PPC
  3. AMD graphics doesn't work with AMD Catalyst drivers
  4. Best Radeon for a Power Mac G5?
  5. The dangers of Linux kernel development
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. AMD Releases UVD Video Decode Support For R600 GPUs
  8. SSD seems slow