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

Intel Linux DisplayPort MST Support Gets Revised

Intel

Published on 06 June 2014 06:19 AM EDT
Written by Michael Larabel in Intel
2 Comments

For those interested in DisplayPort MST support on Linux to support the specification's multi-stream transport ability, there is now a revised patch-set providing this support.

David Airlie at Red Hat has been working on the DisplayPort Multi-Stream Transport support for some months by the open-source Linux graphics stack. Multi-Stream Transport was added to DisplayPort 1.2 to allow daisy-chaining multiple monitors to a single DisplayPort connector. In the context of this early open-source work, the DisplayPort MST work is mostly aimed around ThinkPads and other laptops that have a dock for exposing an external monitor via DP MST.

The most recent patches under review were publicized last month while David has now published a new patch-set targeting the Intel DRM driver. Airlie wrote on Wednesday, "Another round of the MST support for i915 haswell...The main fix is not talking to devices if HPD isn't asserted, at least on the dock I have it will reply to DPCD without HPD being asserted but it just confuses everyone. Otherwise it contains a bunch of stability fixes, and avoids the worst backtraces of i915 state tracker, which is fine when hw is involved but MST doesn't really fit so well with it, esp when you hot unplug some hardware, and the state tracker expects it to remain in the same state until userspace catches up, (note the hw is gone!)."

This Intel DisplayPort MST support is most likely too late to make it for Linux 3.16 but we can hope this DisplayPort improvement will make it for the Linux 3.17 kernel.

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. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. A Tour Of The New Phoronix Office
  2. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  3. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  4. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
Latest Linux News
  1. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  2. X.Org Server 1.16.1 Released
  3. Mesa Gets Closer To Having OpenGL 4.0 Tessellation Support
  4. Uselessd: A Stripped Down Version Of Systemd
  5. F2FS Tools Gain FSCK Support
  6. FreeBSD 10.1 Has The New VT Driver, Hardware Improvements
  7. AntiMicro 2.6 Yields Greater Compatibility For Gamepads On Linux
  8. OpenGL 3.3 / GLSL 3.30 Lands For Intel Sandy Bridge On Mesa
  9. AMD's RadeonSI Gallium3D Driver Sees Some Improvements
  10. Mesa 10.3 Released With The Latest Open-Source GPU Driver Improvements
Latest Forum Discussions
  1. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  2. Trolling on the Phoronix forums
  3. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  4. New stress testing utility for GPU's
  5. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  6. Can Linux kill a motherboard?
  7. Stop grabbing my keyboard :(
  8. New Group Calls For Boycotting Systemd