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

More ATI Radeon KMS Power Management Fun

AMD

Published on 14 March 2010 08:51 PM EDT
Written by Michael Larabel in AMD
19 Comments

Power management support within the Linux kernel for the ATI Radeon DRM driver has been in development for months and gone through several revisions, but with the forthcoming Linux 2.6.34 kernel there is initial ATI KMS power management support. For making the power management situation even better, over the weekend Alex Deucher of AMD has been working on another set of patches.

In the newest set of ATI power management patches that are available from his personal FreeDesktop.org directory is a patch-set that can be applied against the drm-radeon-testing tree and it begins to utilize the I2C support (also introduced in the Linux 2.6.34 kernel for the ATI DRM) for poking the thermal chips.

Namely these thirteen new patches implement GUI idle IRQ support, support for changing the GPU clocks when the engine is idle, support for turning down the number of active SIMDS when running in a lower power stage for the ATI R600 ASICs and later, and new ASIC specific callback functions.

While this is a good step forward, still on Alex's plate is support for resetting the GPU clocks to the default when the kernel module is unloaded, module support for hwmon i2c thermal chip drivers, hwmon support for monitoring the core temperature and fan speeds on select ATI R600/700 (Radeon HD 2000/3000/4000 series) graphics cards, more robust power state selection, and allow power state selection to be tied to external events such as plugging/unplugging your notebook. Some core areas that also still need to be hooked in is support for memory re-clocking, changing PCI Express lane settings, and voltage adjustments.

Alex announced this newest ATI power management work moments ago on the DRI development 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 Articles & Reviews
  1. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  2. The Lenovo T450s Is Working Beautifully With Linux
  3. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  4. Linux 4.0 Hard Drive Comparison With Six File-Systems
  5. Lenovo ThinkPad T450s Broadwell Preview
  6. How Open-Source Allowed Valve To Implement VULKAN Much Faster On The Source 2 Engine
Latest Linux News
  1. GCC 5.1 RC2 Arrives, GCC 5.1 Planned For Next Week
  2. F2FS For Linux 4.1 Has New Features & Fixes
  3. Phoronix Server Upgrade This Weekend: Dual Haswell Xeons, 96GB DDR4
  4. Google's Experimental QUIC Transport Protocol Is Showing Promise
  5. Red Hat Joins Khronos, The Group Behind OpenGL & Vulkan
  6. NetworkManager Drops WiMAX Support
  7. Wine 1.7.41 Works More On Kernel Job Objects, MSI Patches
  8. Linux 4.1 Has Improvements For The Multi-Queue Block Layer
  9. X.Org Looks To Have Six Summer Projects
  10. DragonFlyBSD Pulls In GCC 5 Compiler
Most Viewed News This Week
  1. Nouveau: NVIDIA's New Hardware Is "VERY Open-Source Unfriendly"
  2. Linux 4.0 Kernel Released
  3. Microsoft Announces An LLVM-Based Compiler For .NET
  4. Linux 4.1 Brings Many Potentially Risky x86/ASM Changes
  5. Encryption Support For EXT4
  6. VirtualBox 5.0 Beta 2 Released
  7. Mozilla Start Drafting Plans To Deprecate Insecure HTTP
  8. Elementary OS 0.3 "Freya" Now Available