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

Kernel Mode-Setting Push For Linux 2.6.29 Kernel

Linux Kernel

Published on 29 December 2008 08:28 AM EST
Written by Michael Larabel in Linux Kernel
10 Comments

David Airlie has just called upon Linus Torvalds to pull the kernel mode-setting framework and Intel KMS driver support into the Linux 2.6.29 kernel. If you're a faithful Phoronix reader this shouldn't come as a surprise since Intel, Red Hat, and others have been busy hacking away at kernel mode-setting to get it ready to merge.

The core kernel mode-setting code will now be in the next mainline kernel release along with the Intel i915 KMS driver, but the kernel must be built with the CONFIG_DRM_I915_KMS option since KMS isn't yet enabled by default. It was just in the previous kernel release, the Linux 2.6.28 kernel, that the Graphics Execution Manager made its way upstream since GPU memory management within the kernel is a prerequisite for having mode-setting done also in the kernel.

Kernel mode-setting allows for faster VT switching, improved suspend-and-resume support, a flicker-free boot experience, eliminating the need for X to be banging on the hardware, and various other benefits. While KMS is finally entering the mainline Linux kernel, it's been shipping as a preview feature in Fedora since earlier this year (A Preview of KMS). Kernel mode-setting is also depended upon by Red Hat's Plymouth boot project as well as Wayland. For more on kernel mode-setting, checkout The State of Kernel Mode-Setting or our other articles.

All that will be supported by KMS in the 2.6.29 kernel is Intel hardware. ATI does have kernel mode-setting support, but it's not ready to be merged into the mainline kernel due to its dependence on the TTM memory manager rather than GEM. We previously talked about the GEM-ified TTM manager for the ATI driver, but a new version of TTM must come about or the Radeon memory management code be redesigned so that it can be pushed upstream. If this work can be accomplished in the next three months we could possibly see it in the Linux 2.6.30 kernel. Any NVIDIA kernel mode-setting support is still a ways out since the third-party Nouveau driver depends upon Translation Table Maps as well and there isn't even a stable 2D Nouveau driver out yet.

The mailing list message asking Linus to pull KMS and the i915 KMS driver into Linux 2.6.29 can be read 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 Linux Hardware Reviews
  1. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
  2. Sumo's Omni Gets Reloaded
  3. AMD A10-7800 & A6-7400K APUs Run Great On Linux
  4. Radeon Gallium3D Is Running Increasingly Well Against AMD's Catalyst Driver
Latest Linux Articles
  1. Intel Sandy Bridge Gets A Surprise Boost From Linux 3.17
  2. Open-Source Radeon Graphics Have Some Improvements On Linux 3.17
  3. CPUFreq Scaling Tests With AMD's Kaveri On Linux 3.16
  4. Enabling HyperZ Is Still An Easy Way For Faster RadeonSI Performance
Latest Linux News
  1. DirectFB Updates GTK3 Support, Working Towards DirectFB 1.8
  2. Userptr Support Set For AMD Radeon GPUs In Linux 3.18
  3. NVIDIA Releases CUDA 6.5 As A Huge Update
  4. GNOME 3.14 Beta Makes GLSL Optional, Supports Wayland Gesture/Touch Events
  5. KDE Software Compilation 4.14 Released
  6. The Many Things You Can Build With A Raspberry Pi
  7. AMD's Catalyst Linux Driver Preparing For A World Without An X Server?
  8. Khronos Publishes Its Slides About OpenGL-Next
  9. Proposed: A Tainted Performance State For The Linux Kernel
  10. Systemd 216 Piles On More Features, Aims For New User-Space VT
Latest Forum Discussions
  1. AMD Offers Mantle For OpenGL-Next, Pushes Mantle To Workstations
  2. Systemd 216 Piles On More Features, Aims For New User-Space VT
  3. Dead Island for Linux (?)
  4. The dangers of Linux kernel development
  5. Remote gui not accessible in Phoronix Test Suite 5.2
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. Next-Gen OpenGL To Be Announced Next Month
  8. OpenGL 4.5 Released With New Features