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

Canonical Starts Work On Mir Multi-Monitor Handling

Ubuntu

Published on 31 July 2013 07:02 AM EDT
Written by Michael Larabel in Ubuntu
22 Comments

One of the feature limitations of using the Mir Display Server up to this point has been when using multiple monitors (or say a laptop connected to a projector) the only display configuration possibility is using a cloned mode whereby the screens are the same. Canonical's Mir developers have begun working on improved multi-monitor handling.

With revision 892 made to Mir on Tuesday, this very big commit ends up adding support for non-cloned display configurations. Introduced with this commit is no longer being limited to having cloned displays but now there's a side-by-side display configuration whereby the displays are offset on the screen based upon resolution. This support works when using GBM with outputs exposed via a kernel mode-setting driver.

The branch where the code was pulled from notes:
This MP adds support for arbitrary display configurations (see the SideBySide configuration policy in one of tests for a non-cloned configuration). Next step is to make the hardware cursor behave properly with multiple monitors.

To see this in action change the DefaultDisplayConfigurationPolicy to act like e.g. the side by side configuration policy, and run mir_demo_standalone_render_surfaces. You should see the mir surfaces moving between connected monitors (the virtual space they move in is the bounding rectangle of the two screens).

MM support in GBM works by grouping together outputs that overlap in the virtual coordinate space, either completely, as in clone, or partially. Each group uses the same DisplayBuffer that covers the bounding rectangle of all outputs in the group. Outputs that don't overlap with any other outputs live in their own group and have their own DisplayBuffer. We can fine tune the details of the policy in upcoming MPs as needed (e.g. create separate DisplayBuffers if the overlap is small or the resulting DisplayBuffer is too large).

Also committed on Tuesday with another revision a new --nested-mode option for running a Mir Display Server in a nested configuration atop an already present Mir process.

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. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  2. KVM Benchmarks On Ubuntu 14.10
  3. X.Org Server 1.16 Officially Released With Terrific Features
  4. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
Latest Linux News
  1. NVIDIA Is Working Towards VDPAU H.265/HEVC Support
  2. Hawaii Bug-Fixes Start Hitting Mainline RadeonSI Gallium3D
  3. The FFmpeg vs. Libav War Continues In Debian Land
  4. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  5. GCC As A Just-In Time Compiler Is An Interesting Project
  6. Age Of Wonders III Is Still Being Ported To Linux
  7. Git 2.1 To Further Mainline Windows Support Patches
  8. Debian 8.0 Jessie Is Settling For Linux 3.16
  9. Meson: A Next-Gen Build System Showing Promise
  10. Linux 3.16-rc7 Calms Things Down For The Linux 3.16 Kernel
Latest Forum Discussions
  1. Debian + radeonsi
  2. Open-source drivers on ATI R7 260X
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. List of Linux friendly Kickstarter projects
  5. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  6. Porting Mesa to the Playstation 2
  7. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  8. Table test