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

RandR 1.4 Brings Per-CRTC Pixmaps; NVIDIA Support?

X.Org

Published on 05 December 2010 08:20 AM EST
Written by Michael Larabel in X.Org
7 Comments

While version 1.4 of the Resize and Rotate (RandR) extension was supposed to be introduced with X.Org Server 1.9 (to the point that it delayed closing their merge window), it never made it. RandR 1.4 and its per-CRTC pixmaps once again delayed closing the merge window, but this time it's for X.Org Server 1.10 and its promised to only be a few days. Fortunately, it looks like Keith Packard was right this time and RandR 1.4 is about to land.

Intel's Keith Packard wrote a few emails to the X.Org developers over the night commenting on his per-CRTC pixmap implementation for RandR 1.4 in xorg-server 1.10. For those unfamiliar, this support basically provies, "multiple scan-out buffers which applications can create and assign to arbitrary collections of CRTCs. These pixmaps can be associated with a window for use with OpenGL or drawn to directly." This feature really becomes useful when dealing with display setups where the screen layout exceeds the maximum size of the rendering/scan-out engines, provides the abilities for integrating compositing and project transformation into one step, and eliminating visual artifacts during screen rotation.

The technical details behind this xorg-server/RandR implementation can be found in this message. As part of this work, Keith also added support to RandR 1.4 for sprite transforms This will make per-CRTC pixmaps more useful to extended and/or rotated desktops. The technical side of this implementation is documented in this email.

As another change done by Keith last night, with RandR 1.4, NVIDIA may finally be more prone to supporting RandR 1.2+ in their proprietary Linux/Unix graphics driver. While NVIDIA promised proper RandR 1.2 support for their binary graphics driver two years ago, it has yet to come with any screen manipulation still really needing to be done through NVIDIA's extensions where implemented like with their NVIDIA Settings panel. However, last night Keith commented on a discussion (the message) he had with one of NVIDIA's Linux engineers some years ago.

NVIDIA's position was that they could not support the Resize and Rotate extension since their driver couldn't access the mode-setting instructions provided by RandR as a whole, but rather each mode-setting step is submitted to the driver individually. Keith has changed this in RandR 1.4 by adding a new RandR request (RRSetCrtcConfigs) that allows the sending of all instructions over to the X driver in one step. Hopefully now we will see RandR 1.2/1.3/1.4 support finally coming to NVIDIA's proprietary Linux driver in the near future.

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. Rosewill RS-MI-01: An Ultra Low-Cost Mini-ITX Chassis
  2. D-Link DCS-2330L HD Wireless Network Camera
  3. Gigabyte AM1M-S2H
  4. AMD's New Athlon/Semprons Give Old Phenom CPUs A Big Run For The Money
Latest Linux Articles
  1. AMD Catalyst 14.4 On Linux With Radeon R3 APU Graphics
  2. Red Hat Enterprise Linux 7.0 RC Benchmarks
  3. AMD Catalyst 14.4 Brings Few Linux Performance Improvements
  4. The Performance Of Fedora 20 Updated
Latest Linux News
  1. R600 Gallium3D Lands Many OpenGL Fixes
  2. LLVMpipe Gallium3D Now Exposes GLSL 3.30
  3. NGINX 1.6 Brings SPDY 3.1 & Other New Features
  4. Linux Foundation Announces A Core Infrastructure Initiative
  5. More Steam Linux Tests/Benchmarks Might Be Coming
  6. NVIDIA's Amazing Single-Board ARM Computer Might Be Delayed
  7. Fedora 21 To Get A Playground, New Features
  8. PC-BSD Is Developing Its Own Desktop Environment
  9. Valve Is Bringing VOGL To Windows & Working On Regression Tests
  10. Canonical Is Taking Over Linux 3.13 Kernel Maintenance
  11. Google Web Designer Is Now Natively Available On Linux
  12. Ubuntu 14.10 Is Codenamed The Utopic Unicorn
Latest Forum Discussions
  1. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  2. HTPC-upgrade advice: AMD Richland A8-7600 or Kaveri A10-6700T ???
  3. What Else Would You Like To See On Phoronix This Spring?
  4. The GNOME Foundation Is Running Short On Money
  5. The Most Amazing OpenGL Tech Demo In 64kb
  6. Announcing radeontop, a tool for viewing the GPU usage
  7. New card. Open source drivers only.
  8. Script for Fan Speed Control