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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 .
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