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

Two Intel Graphics Features Get Pulled From Linux 3.17

Intel

Published on 09 August 2014 02:20 PM EDT
Written by Michael Larabel in Intel
Comment On This Article

Linux 3.17-rc1 is still about one week away at least, but already two commits of new functionality were reverted from the Intel DRM driver code for Linux 3.17.

The first revert yesterday to the Linux Git code was in regards to semaphores support for Broadwell. Semaphores support for Broadwell -- a performance-boosting feature -- was part of Intel's big set of changes for this kernel merge window. The DRM pull was just sent in a few days ago but Intel developers decided to end up disabling the semaphores support in a drm-intel-fixes pull request they already submitted to Linus Torvalds.

Semaphores for Broadwell is disabled until further testing has happened. There were still hangs on the Broadwell hardware of Intel engineers and even some slowdowns in performance, so until further testing and optimizations have taken place, this feature is disabled. At least Intel OTC developers have a few months to fix-up the semaphores support before Broadwell hardware is common to the marketplace.

The other Intel feature revert happened by Linus Torvalds. Linus had warned earlier on Friday following the drm-intel-fixes merge, "Hmm. My laptop no longer resumes properly. Or rather, I suspect it resumes, but the screen is black. I will bisect, and I *will* revert if I find the offending commit. I need that laptop for travel next week." Linus ended up finding it was due to enabling the Panel Self Refresh (PSR) feature.

As Linus is traveling with his Sony Vaio Pro 11 next week with its Haswell ULT that's affected by this bug breaking the suspend and resume process, he reverted that feature from being enabled by default. He will only allow it to be re-enabled for the next cycle (Linux 3.18) if it's properly fixed-up by Intel. Panel Self Refresh is a feature found with DisplayPort 1.3 / eDP 1.3. Panel Self Refresh allows for conserving power use by being able to power down the GPU and related circuitry when displaying a static image rather than constantly refreshing the display if the screen contents have been unchanged.

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. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  2. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
  3. RadeonSI Gallium3D vs. Catalyst At 4K UHD On Linux
  4. MSAA RadeonSI Gallium3D Performance Preview
Latest Linux News
  1. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  2. Fedora 21 Alpha Finally Coming Next Week
  3. Ubuntu Touch/Phone Reaches Its First RTM Image
  4. The KMS Mode-Setting Driver Was Imported For X.Org Server 1.17
  5. SNA & UXA Intel Benchmarks With X.Org Server 1.16
  6. Graphics Driver Changes Coming In The Linux 3.18 Kernel
  7. Tropico 5 Being Released For Linux Gamers This Week
  8. Eclipse IDE Starts Firing Up On Wayland's Weston
  9. OpenSUSE Announcement On SUSE's Recent Merger
  10. Valve Begins Publicly Tracking AMD Catalyst Linux Issues
Latest Forum Discussions
  1. New Group Calls For Boycotting Systemd
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. Stop grabbing my keyboard :(
  4. Best Radeon for a Power Mac G5?
  5. New stress testing utility for GPU's
  6. Hd 6850
  7. support for first generation UVD blocks (RV6xx, RS780, RS880 and RV790)
  8. Nvidia joins the ranks of Apple and Microsoft