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. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. Civilization: Beyond Earth Linux GPU/Driver Benchmarks
  2. X.Org Server 1.16.3 Released To Fix Security Issues
  3. Linux 3.19 Merge Window Closes Ahead Of Schedule
  4. MIPS R6 Architecture Now Supported By GCC
  5. LowRISC To Feature Tagged Memory & Minion Cores
  6. Intel Skylake Audio Support For Linux 3.19
  7. After 10+ Years, NetworkManager Reaches v1.0
  8. VDPAU Updated To v0.9
  9. An Open Hardware Random Number Generator Proposed
  10. LLVM 3.6 Will Be Branched Next Month
Latest Forum Discussions
  1. Are there an app using HSA ?
  2. Need some hand holding with upgrading xserver
  3. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  4. XLennart: A Game For Systemd Haters With Nothing Better To Do
  5. Updated and Optimized Ubuntu Free Graphics Drivers
  6. Debian init discussion in Phoenix Wright format
  7. FPS capped on Linux (AMD fglrx drivers)
  8. Bench specific mount point