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 In Linux 3.11 Is Fantastic With PM, Sea Islands

AMD

Published on 28 June 2013 12:27 AM EDT
Written by Michael Larabel in AMD
19 Comments

The pull request for the Radeon DRM graphics driver changes for the Linux 3.11 kernel has been submitted. The open-source Radeon Linux graphics driver changes in this next kernel development cycle include dynamic power management (including ASPM) and support for Radeon HD 8000 "Sea Islands" graphics processors as the most prominent changes.

The massive dynamic power management work supports from the Radeon HD 2000 "R600" GPUs up through the HD 7000 "Southern Islands" hardware. The massive work inflates the size of the open-source Radeon DRM driver by more than 52 thousand lines of code over the course of one kernel release.

On Wednesday, Phoronix was the first to report on this massive Radeon Linux work. Dynamic power management has been a long-awaited feature of the open-source AMD Linux graphics driver for being able to lower energy consumption of systems running this Catalyst alternative, reduce the temperature of laptops and desktop systems, and just be more efficient.

The dynamic power management support right now provides clockgating, dynamic engine clock scaling, dynamic memory clock scaling, dynamic voltage scaling, and dynamic PCI Express Gen1/Gen2 switching. While this is great, in the Linux 3.11 kernel "DPM" isn't enabled by default. The system needs to be booted with radeon.dpm=1 for enabling dynamic power management.

AMD's Alex Deucher says that it will be off by default until further testing has been completed. The dynamic power management is also reported to be problematic for the R600 (HD 2000) and Norther Islands (HD 6000) graphics cards while other g enerations should be in good shape. Updated Radeon microcode/firmware is also needed by the open-source driver for DPM to work.

Looking forward to the AMD graphics cards launching in a few months time, there's the initial kernel support for Radeon HD 8000 "Sea Islands" / "CIK" graphics cores. This initial support provides the kernel bits for 3D/OpenGL, GPGPU/Compute, and UVD video decoding. There's still Radeon HD 8000 Sea Islands Mesa/Gallium3D patches to be merged in user-space, which will extend the RadeonSI Gallium3D driver, but this is just the kernel bits. It's really great to see AMD finally getting in new hardware ASIC support prior to the public debut.

In between all of the exciting new features, there's also many bug-fixes to be found in the Radeon DRM code with hopefully not too many new regressions.

The Radeon DRM 3.11 changes for the drm-next tree pull request can be found on the dri-devel list.

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. Rosewill RS-MI-01: An Ultra Low-Cost Mini-ITX Chassis
  2. D-Link DCS-2330L HD Wireless Network Camera
  3. Gigabyte AM1M-S2H
  4. AMD's New Athlon/Semprons Give Old Phenom CPUs A Big Run For The Money
Latest Linux Articles
  1. AMD Catalyst 14.4 Brings Few Linux Performance Improvements
  2. The Performance Of Fedora 20 Updated
  3. Clang Fights GCC On AMD's Athlon AM1 APU With Jaguar Cores
  4. Ubuntu 14.04 LTS vs. Oracle Linux vs. CentOS vs. openSUSE
Latest Linux News
  1. Fedora 21 To Get A Playground, New Features
  2. PC-BSD Is Developing Its Own Desktop Environment
  3. Valve Is Bringing VOGL To Windows & Working On Regression Tests
  4. Canonical Is Taking Over Linux 3.13 Kernel Maintenance
  5. Google Web Designer Is Now Natively Available On Linux
  6. Ubuntu 14.10 Is Codenamed The Utopic Unicorn
  7. Audacious 3.5 Lightweight Audio Player Released
  8. Steam Updated For Ubuntu 14.04 LTS, SteamOS
  9. DNF 0.5 Yum Replacement Now Supports Groups
  10. Red Hat Enterprise Linux 7.0 Is Looking Fantastic
  11. Intel Is Launching An Interesting Bay Trail NUC Next Week
  12. Another X.Org EVoC Proposed For OpenGL 4+ Tests
Latest Forum Discussions
  1. The GNOME Foundation Is Running Short On Money
  2. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  3. The Most Amazing OpenGL Tech Demo In 64kb
  4. Announcing radeontop, a tool for viewing the GPU usage
  5. HTPC-upgrade advice: AMD Richland A8-7600 or Kaveri A10-6700T ???
  6. New card. Open source drivers only.
  7. Script for Fan Speed Control
  8. Torvalds Is Unconvinced By LTO'ing A Linux Kernel