DisplayPort MST Code Starts Lining Up For Linux 3.17, Other DRM Changes
Written by Michael Larabel in Linux Kernel on 8 July 2014 at 02:16 AM EDT. 2 Comments
The DisplayPort MST support code that's been in the works for several months is starting to land with the Linux 3.17 kernel that will be officially entering development stages next month.

David Airlie at Red Hat has started merging some of his DisplayPort Multi-Stream (DP MST) support code into his drm-next branch for eventual merging into Linux 3.17. David has been hacking on the code for several months and has basic DP MST working on Linux -- the Multi-Stream Transport support is for daisy-chaining multiple DisplayPort connections, as needed by some 4K displays and other setups, and for David's main Linux use-case is the technology is used by some recent Lenovo ThinkPad dock setups. David's testing has been mostly centered around a Haswell-class Lenovo ultrabook with MST-based dock for its external graphics.

The DP MST code has been under review by open-source developers and is starting towards the next stage of mainline integration. So far though for drm-next is the multi-stream helper code that was merged a few hours ago.

On a separate note, worth pointing out for another merge into drm-next is UDL vBlank support and UDL page-flip ioctl support. UDL is the DisplayLink open-source DRM driver for the USB VGA devices. Also worth noting is that universal planes are no longer experimental with this next kernel release cycle.

Stay tuned for more coverage of Linux DRM graphics driver improvements for Linux 3.17 in the weeks ahead.

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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 10,000 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 or contacted via MichaelLarabel.com.

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