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

Today, Delayed GPU Switching Comes To Linux

Linux Kernel

Published on 03 February 2010 09:59 AM EST
Written by Michael Larabel in Linux Kernel
24 Comments

Two days ago we reported on hybrid graphics coming to Linux in a crude form that allowed switching between graphics processors on notebook computers that utilize dual graphics processors, one that's meant to deliver the best energy efficient performance while the other GPU is for maximizing the graphics performance in demanding environments. Just 24 hours after this kernel patch hit the Internet it already went through four revisions by Red Hat's David Airlie, which delivered better switching and greater notebook compatibility. Since yesterday this patch has already undergone a few more revisions.

The Linux hybrid graphics patch known as "vga_switcheroo" is now on its sixth revision. The fifth iteration of the graphics switcheroo migrated some of the ATPX handling in the xf86-video-ati driver and the sixth does some preparatory work for hooking in Nouveau support so that NVIDIA graphics processors can be switched on and off. The latest version of this patch can be viewed here.

Airlie has also written a second patch that adds delayed GPU switching. Rather than needing to shutdown the X Server, change run-levels, write to /sys/kernel/debug/vgaswitcheroo/switch, and change back, delayed switching makes the process of switching between GPUs a lot easier. This patch still allows immediate graphics switching to a discrete GPU and an integrated graphics processor, but the delayed switching basically postpones the switch until the X.Org Server is restarted. In other words, it's a lot cleaner to integrate that as soon as you log-out and GDM restarts itself, the delayed switch can occur automatically.

Now we just need the Nouveau driver properly hooked in for NVIDIA graphics card support, GDM integration, and then for the kernel patches to be merged into the mainline kernel. Judging by the pace at which Airlie is attacking this hybrid graphics support, perhaps it will be done tomorrow?

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. NVIDIA GeForce GTX 980: The Best GPU For Linux Gamers
  2. ROCCAT LUA: A Linux-Friendly Gaming Mouse
  3. Cheetah Mounts: The Affordable Way To Put Your TV On The Wall
  4. Scythe Mugen MAX
Latest Linux Articles
  1. Preview: Radeon Gallium3D Performance For CS:GO On Linux
  2. XWayland Linux Gaming Performance With GNOME Wayland On Fedora 21
  3. EXT4/Btrfs/XFS/F2FS Benchmarks On Linux 3.17
  4. Fedora 21 Alpha First Impressions: It's Great
Latest Linux News
  1. Microsoft Announces... Windows 10 With A Start Menu
  2. Borderlands 2 Launches On Steam For Linux
  3. Debian Jessie Might Get Rid Of The kFreeBSD Port
  4. Fedora Might Try A New Scheduling Strategy For Its Releases
  5. AMD's Catalyst Working On A GLSL Shader Cache
  6. OpenMP 4.0 Offloading Is Closer For GCC 5
  7. Wayland Presentation Extension Added To Weston
  8. Intel Skylake Support Rolls Out To Mesa's DRM
  9. VA-API's Libva 1.4.0 Brings VP8 Encoding Support
  10. Operating System U Fails To Live Up To Its Goals
Latest Forum Discussions
  1. NVIDIA Alerts Nouveau: They're Starting To Sign/Validate GPU Firmware Images
  2. FSF Issues Statement On Shellshock Bash Vulnerability
  3. New AMD Catalyst drivers out today
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. Take the Steam Survey results with a grain of salt. It is flawed.
  6. AMD Wants To Know What's Wrong With Catalyst
  7. New Group Calls For Boycotting Systemd
  8. Counter-Strike: Global Offensive NVIDIA/AMD Benchmarks On Linux