Radeon DisplayPort MST Queued For Linux 4.1

Written by Michael Larabel in Radeon on 23 March 2015 at 12:07 PM EDT. 1 Comment
The Linux 4.1 kernel will feature support for Radeon DisplayPort Multi-Stream Transport so that this open-source AMD Linux graphics driver can work with the latest high resolution DP displays and modern laptop docking stations.

David Airlie of Red Hat had been working on DP MST support within the Linux DRM drivers for a while and after getting the Intel code squared away he moved on to the Radeon driver as talked about in recent Phoronix articles. The Radeon DisplayPort MST code is now into shape and is queued up in DRM-Next for ultimately being merged into Linux 4.1.

DisplayPort Multi-Stream Transport (DP MST) is important for newer 4K/5K monitors that expose themselves as two DisplayPort connections as well as some newer hardware like ThinkPad docking stations that rely upon this technology for multi-monitor support.

While the open-source Radeon DP MST support will appear in Linux 4.1, it's disabled by default. Other early Linux 4.1 changes for Radeon include non-ATOM AUX support, new profiling / Gallium HUD queries, and other fixes. This batch of Radeon updates was pulled in last night to DRM-Next. Sadly there's still no word on the new AMDGPU kernel driver.
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Michael Larabel

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.

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