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 Benchmarking Platform
Phoromatic Test Orchestration

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 Articles & Reviews
  1. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  2. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  3. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  4. The Lenovo T450s Is Working Beautifully With Linux
  5. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  6. Linux 4.0 Hard Drive Comparison With Six File-Systems
Latest Linux News
  1. Phoronix Server Migration
  2. GCC 5.2 Will Come In Two To Three Months
  3. AMD FP3 Motherboard Ported To Coreboot
  4. The Difference In Optimizations Between NIR & GLSL
  5. OpenMandriva Lx 3 Alpha: Adds UEFI Support, Defaults To LXQt
  6. Systemd Kills Off Shutdownd
  7. There's Now More Than 1,100 Games On Steam For Linux
  8. Btrfs In Linux 4.1 Has Fixes For File-Systems Of 20 Terabytes & Up
  9. Microsoft's CoreCLR Now Works On FreeBSD
  10. Unigine 2.0 Beta 2 Brings PBR, SSR, Kinect 2 Support
Most Viewed News This Week
  1. AMD Releases New "AMDGPU" Linux Kernel Driver & Mesa Support
  2. Ubuntu's Desktop-Next Switching From .DEBs To Snappy
  3. My Favorite Computer Desk Of The Past Decade For Less Than $100
  4. AMD Open-Sources "Addrlib" From Catalyst
  5. Library Operating System (LibOS) For Linux Still Being Pursued
  6. Debian 8.0 Jessie Is Ready For Release This Weekend
  7. GIMP's Porting To GTK3 Continues
  8. Features Thus Far For The Linux 4.1 Kernel