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

4K Tiled Displays Become An Issue With X.Org

X.Org

Published on 17 January 2014 10:45 AM EST
Written by Michael Larabel in X.Org
21 Comments

Aaron Plattner of NVIDIA has laid out the latest problem in the X.Org world: how to deal with 4K tiled displays that show themselves to the PC as two displays.

With some DisplayPort 4K displays, they expose themselves to the PC as two DisplayPort 1.2 multi-stream devices. These displays having matching GUIDs to tell they are from the same device but different EDID, additionally some information is supposed to be provided for revealing their orientation.

These 4K tiled displays are a problem for the Linux graphics stack and now there needs to be some generally agreed upon guidance for how to support these displays with some applications treating them as completely separate monitors -- e.g. only being able to maximize to half of the display, games not displaying correctly, etc.

Among the options being evaluated by Aaron Plattner would be to hide the presence of the second tile in the X.Org Server, hiding the second tile in the X RandR library, updating all RandR 1.2+ applications for making them aware of tiled displays, or simply doing nothing and hoping that single-tile 4K displays become very common quickly. Aaron has also proposed a new OutputGroup property for the Resize and Rotate extension.

There hasn't been much feedback yet on this call for action about 4K tiled displays on Linux, but you can check this xorg-devel thread for updates. For those curious about GPU / driver testing on 4K displays, you can see my 4k Linux graphics testing from a 39-inch Seiki 4K TV.

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. NVIDIA GeForce GTX 980: The Best GPU For Linux Gamers
  2. ROCCAT LUA: A Linux-Friendly Gaming Mouse
  3. Cheetah Mounts: The Affordable Way To Put Your TV On The Wall
  4. Scythe Mugen MAX
Latest Linux Articles
  1. Preview: Radeon Gallium3D Performance For CS:GO On Linux
  2. XWayland Linux Gaming Performance With GNOME Wayland On Fedora 21
  3. EXT4/Btrfs/XFS/F2FS Benchmarks On Linux 3.17
  4. Fedora 21 Alpha First Impressions: It's Great
Latest Linux News
  1. Microsoft Announces... Windows 10 With A Start Menu
  2. Borderlands 2 Launches On Steam For Linux
  3. Debian Jessie Might Get Rid Of The kFreeBSD Port
  4. Fedora Might Try A New Scheduling Strategy For Its Releases
  5. AMD's Catalyst Working On A GLSL Shader Cache
  6. OpenMP 4.0 Offloading Is Closer For GCC 5
  7. Wayland Presentation Extension Added To Weston
  8. Intel Skylake Support Rolls Out To Mesa's DRM
  9. VA-API's Libva 1.4.0 Brings VP8 Encoding Support
  10. Operating System U Fails To Live Up To Its Goals
Latest Forum Discussions
  1. FSF Issues Statement On Shellshock Bash Vulnerability
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  4. Advertisements On Phoronix
  5. NVIDIA Alerts Nouveau: They're Starting To Sign/Validate GPU Firmware Images
  6. New AMD Catalyst drivers out today
  7. Take the Steam Survey results with a grain of salt. It is flawed.
  8. AMD Wants To Know What's Wrong With Catalyst