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

A Day Later, Hybrid Graphics On Linux Does More

Linux Kernel

Published on 02 February 2010 09:14 AM EST
Written by Michael Larabel in Linux Kernel
11 Comments

Just yesterday morning we reported on hybrid graphics coming to Linux in a crude form, which allowed dual-GPU notebook systems to switch between the onboard GPUs via a kernel patch but what made it crude was that it wasn't seamless switching within the running X.Org Server (it won't be this way for some time) and it didn't actually turn off the other GPU when the other one was in use. In the past 24 hours, however, David Airlie has published three new versions of this Linux kernel patch.

The second version of Airlie's "switcheroo" code as it's called brought support for powering up and powering down the GPUs. For Intel GPUs this means putting it in a D3 suspended state while for Mobility Radeon GPUs it actually cuts the power to the graphics processor so that it is completely off. The third version of switcheroo then brought reworked probing methods so that no DMI list is used but now looks for an ATPX method. The fourth (and final, for now) version of this patch delivers on compatibility with more systems. Turning on and off the unused GPU is as easy as writing "ON" or "OFF" to /sys/kernel/debug/vgaswitcheroo/switch.

The fourth version of David Airlie's switcheroo patch can be found in his FreeDesktop.org folder. Additionally, he has provided new comments on this work via his blog. Right now this code supports ATI/ATI and Intel/ATI GPU combos, but David mentions on his blog that the Nouveau driver should already be detecting the DSM method that it likely uses for the NVIDIA GPU switching, so it really shouldn't be too difficult to wire it up.

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. Intel Broadwell: GCC 4.9 vs. LLVM Clang 3.5 Compiler Benchmarks
  2. Ubuntu vs. Fedora Linux On Lenovo's X1 Carbon With Core i7 Broadwell
  3. Ubuntu 15.04 Is The Easy Path To Better Performance On Intel Broadwell
  4. NVIDIA's Latest Maxwell Line-Up Against AMD With Catalyst On Linux
  5. Preliminary Tests Of Intel Sandy Bridge & Ivy Bridge vs. Broadwell
  6. AMD FX-8320E Performance On Linux
Latest Linux News
  1. Linux Benchmarking... Even Faster & A Very Interesting February
  2. Does VirtualBox VM Have Much A Future Left?
  3. HAMMER2 File-System Is Still Slowly Coming Together
  4. The Better Looking Window Decorations For GNOME 3.16
  5. Libinput 0.9 Adds Support For Hovering Fingers On Touchpads
  6. Free Software Foundation Endorses Another (Outdated) Laptop
  7. DNF Plugins Extend The Functionality Of Fedora's Yum Successor
  8. LibreOffice 4.4 Released With Better OOXML Support, UI Improvements
  9. Inkscape 0.91 Goes Through C++ Code Conversion, New Cairo Rendering, OpenMP Filters
  10. New Mesa Patch To Improve CPU-Bound Applications
Most Viewed News This Week
  1. PlayStation 4 System Compiler Support Landing In LLVM
  2. LibreOffice 4.4 Is Coming Soon With New Features
  3. Linux "GHOST" Vulnerability Hits Glibc Systems
  4. Broadwell Linux Ultrabook Running MUCH Cooler Than Haswell
  5. LZHAM 1.0 Lossless Data Compression Codec Released
  6. Linux Users Upset By Chromium's Busted HiDPI Support
  7. Vivaldi: A New Chromium-Powered, Multi-Platform Browser
  8. LLVM Adds Options To Do Fuzz Testing