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 Benchmarking Platform
Phoromatic Test Orchestration

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 News
  1. Global Shortcuts In KDE Plasma Under Wayland
  2. LLVMpipe FP64 Support Knocks Off Some GL4 Extensions
  3. Dell Gets An Airplane Mode Switch Driver In Linux 4.2
  4. I Gave Up Waiting On The Water-Cooled Radeon R9 Fury X
  5. NVIDIA Tegra X1 Chromebooks Appear Closer, Support Added To Coreboot
  6. Pinos Is For Linux Video What PulseAudio Is For Audio
  7. Crossing 200,000 Benchmark Results Posted On LinuxBenchmarking.com
  8. New Mesa Vec4 Backend For Intel, Supports Their NIR Goals
  9. "PulseVideo" Coming To Complement PulseAudio?
  10. Premium Users Now Can Experience Our New Site
Latest Articles & Reviews
  1. How KDE VDG Is Trying To Make Open-Source Software Beautiful
  2. Attempting To Try Out BCache On The Linux 4.1 Kernel
  3. CompuLab's Fitlet Is A Very Tiny, Fanless, Linux PC With AMD A10 Micro
  4. AMD A10-7870K Godavari: RadeonSI Gallium3D vs. Catalyst Linux Drivers
Most Viewed News This Week
  1. Kubuntu 15.10 Could Be The End Of The Road
  2. NVIDIA Starts Supplying Open-Source Hardware Reference Headers
  3. KDBUS Won't Be Pushed Until The Linux 4.3 Kernel
  4. The Staging Pull For Linux 4.2: "Big, Really Big"
  5. The State & Complications Of Porting The Unity Editor To Linux
  6. SteamOS "Brewmaster" Is Valve's New Debian 8.1 Based Version
  7. Jonathan Riddell Steps Down From The Kubuntu Council
  8. ARM Posts Pictures Of AMD's New Development Board