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's Patches Proposed For Adding Legacy UMS

Intel

Published on 25 August 2010 10:31 AM EDT
Written by Michael Larabel in Intel
9 Comments

Back in July we reported on driver work done by Intel's Chris Wilson to add back user-space mode-setting support to the Intel X.Org DDX driver (xf86-video-intel) to allow those with older Intel (i8xx) chipsets where kernel mode-setting can be buggy to at least have a decent experience with UMS. Intel was quick to strip out user mode-setting support from their X.Org driver once their KMS support was stabilized, but it turns out that old Intel hardware with UXA (the GEM-ified EXA) and kernel mode-setting was buggy and could lead to artifacts and stability issues. These problems had led Ubuntu and other distribution vendors to use old Intel drivers so that they wouldn't be shafting a small percent of their users with vintage Intel hardware.

Testing of the legacy Intel driver work done by Chris to integrate back a user-space mode-setting path for this old hardware (and the UMS path also works with new Intel chipsets too) along EXA 2D acceleration has been somewhat positive, but it hasn't addressed all problems reported by Intel Linux users. This also just provides an older code path for users rather than addressing the actual problems with GEM/KMS itself for these customers.

Chris Wilson has submitted his patch yesterday afternoon to the Intel mailing list to re-integrate legacy user-space mode-setting support into the open-source driver. This would add over 48,000 lines of code back to the Intel driver as it takes all of their 2D non-GEM EXA acceleration code from their xf86-video-intel 2.6 driver with updates through their xf86-video-intel 2.9 driver (right before EXA/UMS was dropped).

Though in order for this code to be pulled back into the mainline Linux 2D driver, Chris/Intel would like a commitment from distribution vendors to supporting and using this older code. "I'd like a show of commitment from the distributions that this is how we should proceed. Our goal, and our focus, is on providing KMS and GEM for Intel chipsets. We do not want legacy/ums to hinder that, however we also do not want to leave machines behind (i8xx, the current bane of our existence) and force each distributions to fork their own legacy driver."

Those wanting to try this legacy UMS driver can find the code in the legacy branch of Chris Wilson's xf86-video-intel driver. This work could be integrated and released with xf86-video-intel 2.13, which will be Intel's next quarterly driver update and will be released within a month or two.

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. Intel Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
  2. Is The Open-Source NVIDIA Driver Fast Enough For Steam On Linux Gaming?
  3. Linux 3.18 File-System Performance Minimally Changed But Possible Regressions
  4. AMD Radeon Gallium3D Is Catching Up & Sometimes Beating Catalyst On Linux
Latest Linux News
  1. HandBrake 0.10 Brings H.265 & VP8 Encoders
  2. Gngr: A New Web Browser Focused On Privacy
  3. Linux 3.18 Kernel: Not Much Change With Intel Haswell Performance
  4. More File-System Tests Of The Linux 3.18 Kernel
  5. Using NVIDIA's NVENC On Linux With FFmpeg
  6. There's Talk Again About An "Open To The Core" Ubuntu Laptop
  7. PowerVR SGX Driver Code Gets Leaked
  8. V2 Of KDBUS Published For Linux Kernel Review
  9. VirtualBox 4.3.20 Arrives, Still No Sign Of VirtualBox 4.4
  10. Scientific Linux 6.6 vs. Scientific Linux 7.0 Benchmarks
Latest Forum Discussions
  1. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  2. Debian Developer Resigns From The Systemd Maintainership Team
  3. Roadmap to Catalyst 14.10 ?
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. Cant get working Kaveri APU - A10-7850k
  6. Script for Fan Speed Control
  7. Debian Init System Coupling Vote Results
  8. The Slides Announcing The New "AMDGPU" Kernel Driver