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

X.Org Server GPU Hot-Plugging Moves Along

X.Org

Published on 22 December 2011 03:40 PM EST
Written by Michael Larabel in X.Org
2 Comments

David Airlie has achieved a bit more success in his GPU "PRIME" work to provide graphics processor hot-plugging support under Linux with the X.Org Server.

One month ago I wrote about Airlie's PRIME work getting back under-way for GPU offloading support. This news came a month after a working X.Org GPU hot-plugging prototype by Airlie.

That early code showed a DisplayLink USB-based display adapter working automatically as soon as it was plugged in -- the DRM driver being dynamically loaded and then the display lighting up with an X.Org environment. At that point David talked about his ambitions of eventually getting to a point where one GPU could do the actual rendering and to then pass the memory objects onto another GPU so that they could then be scanned out to an attached display. What Airlie now has to report on before ending out the year is basically these advancements.

The use-cases he's been working with on this X.Org Server hot-plugging code is to support Intel rendering and to offload then to a NVIDIA graphics card using the Nouveau driver, Nouveau rendering with a DVI output and then an Intel LVDS output, and then a USB hot-plugged display with either the Intel or Nouveau driver doing the actual rendering work.

He's re-based his PRIME code atop his "dma-buf" upstream work, which is successfully working for sharing a buffer between two Linux DRM drivers. The kernel PRIME "magic" shares a DRI2 front pixmap between devices/drivers and also sharing a pixmap that the rendering GPU copies dirty updates to and the "GPU output slaves" use that as their scan-out pixmap. He's been focusing upon the Intel, Nouveau, and DisplayLink kernel drivers for this initial PRIME work, but sadly not Radeon at this time.

His short-term TODO list is to address issues with the Nouveau/EXA port rendering, issues with xcompmgr, and adding USB output slave support. Longer out on his TODO list is working on controlling the different options via the RandR protocol, and lastly is implementing GLX_ARB_robustness support.

Those wanting to learn more can read today's blog post by David Airlie or checkout his drm-prime-dmabuf Git repository. It will likely be a while before all of the pieces for GPU hot-plugging with X.Org and the Linux kernel are successfully merged to mainline.

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. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  2. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
  3. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
  4. Sumo's Omni Gets Reloaded
Latest Linux Articles
  1. The Most Energy Efficient Radeon GPU For AMD Linux Gaming
  2. 20-Way Radeon Comparison With Open-Source Graphics For Steam On Linux Gaming
  3. Preview: OS X 10.10 Yosemite vs. Ubuntu Linux GPU Performance
  4. Radeon Graphics Yield Mixed Results With Linux 3.17 Kernel
Latest Linux News
  1. Ubuntu's Utopic Unicorn 14.10 Beta 1 Released
  2. Genode OS 14.08 Has New GUI Architecture, Pluggable VFS
  3. Another Intel Linux Power Regression Is Being Investigated
  4. DNF Makes It A Step Closer To Replacing Yum On Fedora
  5. OS Battle: Linux Takes 1.7% Desktop Marketshare
  6. PHP 5.6 Officially Released With New Debugger
  7. LibreOffice 4.3.1 Released
  8. Re-Clocking Your NVIDIA GPU With Nouveau On Linux 3.17
  9. Radeon DRM Queues More Changes, RV6xx UVD For Linux 3.18
  10. Metro 2033 Redux Will Hopefully Hit Linux Real Soon
Latest Forum Discussions
  1. Best Radeon for a Power Mac G5?
  2. Canonical Joined The Khronos Group To Help Mir/Wayland Drivers
  3. OC capability - Intel Core i5 4690K & Biostar Hi-Fi Z97WE
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. AMD Releases UVD Video Decode Support For R600 GPUs
  6. Announcing radeontop, a tool for viewing the GPU usage
  7. It's Now Possible To Play Netflix Natively On Linux Without Wine Plug-Ins
  8. [DB] BIOS - ACPI - data collecting