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

Wayland Looks To Do Multi-Monitor The Right Way

Wayland

Published on 09 February 2011 10:42 PM EST
Written by Michael Larabel in Wayland
37 Comments

Two weeks ago the hot discussion item being talked about by those interested in the Wayland Display Server was how to handle input with Wayland (e.g. using X Input, create a separate "Inland" input project, or designing something entirely different). The new subject now brought up on the Wayland mailing list is how to handle multiple monitor support. Fortunately, it looks like Kristian plans to implement multiple monitor/display support in a different -- and better -- way than how it's dealt with by the X.Org Server.

The multi-monitor topic was brought up by Marty Jack after he wrote a patch that allocates the CRTCs to avoid black screens on multiple monitors. Up to this point, Kristian Høgsberg, the creator of Wayland, hasn't really said how he would like support for multiple monitors to be implemented. That changed though this afternoon. In Marty's email, he mentions, "I don't know what Kristian's ultimate vision of this is. Do we allow windows to move like they do now on a virtual desktop where you can slide one to a RightOf monitor by dragging it and it appears part on one and part on the other? A lot of the data structure and processing change for multiple monitors would depend on whether it is possible to have one pair of big FBs added to both CRTCs at the same time, with different (x,y,w,h) if it is tiled and the same (x,y) if it is cloned or how he would want to handle this case [moving the rbo, fb_id, image up to drm_compositor]. With some philosophical guidance I could get the underpinnings in place."

AMD's Alex Deucher was the first to respond with his thoughts. "The sensible way to handle this is one surface per crtc otherwise we run into the same problems we hit with X where a multi-head desktop is too wide for the render/texture limits of the hardware."

Kristian then officially said, "As Alex says, the plan is to have one fb per crtc. The compositor will render the scenegraph into two framebuffers which we will then page flip to each crtc. Eventually we'll only rerender the parts that change so that typically we'll only update the fb where something changed."

For anyone dependent upon multiple displays on their desktop or other systems, this is great news and should be better than the support offered by the X.Org Server and its antiquated code. Only updating the portions of the screen where there's damage / changed contents is a win for performance/efficiency and as said by having one frame-buffer per CRTC will allow multiple displays to be powered without hitting any rendering limitations imposed by having a single frame-buffer spanning multiple CRTCs/displays.

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. Even With Re-Clocking, Nouveau Remains Behind NVIDIA's Proprietary Linux Driver
  2. The Power Consumption & Efficiency Of Open-Source GPU Drivers
  3. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  4. Intel Pentium G3258 On Linux
Latest Linux Articles
  1. AMD Catalyst 14.6 Does Slightly Better With APITest OpenGL Tests
  2. Updated Source Engine Benchmarks On The Latest AMD/NVIDIA Linux Drivers
  3. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  4. KVM Benchmarks On Ubuntu 14.10
Latest Linux News
  1. Builder: A New Development IDE Being Built For GNOME
  2. GDB 7.8 Betters Python Scripting, Adds Guile Support
  3. GNOME's GTK+ Is Still Striving For A Scene Graph, Canvas API
  4. Unreal Tournament Looks Great For Team Deathmatch
  5. LibreOffice 4.3 Released With Many Exciting Changes
  6. GNOME/GTK On Wayland Gains Focus At GUADEC
  7. GNOME Stakeholders Take Issue With Groupon Over their Gnome
  8. GStreamer VA-API Plug-In Update Adds New Features
  9. Qt 5.4 Going Into Feature Freeze Next Week With Exciting Changes
  10. OpenSUSE Factory Turns Into Rolling Release Distribution
Latest Forum Discussions
  1. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  2. Open-source drivers on ATI R7 260X
  3. AMD Athlon 5350 APU On Linux
  4. Debian + radeonsi
  5. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  6. Updated and Optimized Ubuntu Free Graphics Drivers
  7. List of Linux friendly Kickstarter projects
  8. Porting Mesa to the Playstation 2