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 Remains Confident In Fixed-Up RC6

Intel

Published on 24 March 2012 08:45 PM EDT
Written by Michael Larabel in Intel
Comment On This Article

Intel's open-source Linux graphics developers remain confident that we're likely to the final chapter of the lets-try-rc6-by-default-one-more-time saga. The RC6 power-savings feature for Sandy Bridge graphics hardware should hopefully be -- finally -- sane to keep enabled by default.

Last month I wrote that Intel Sandy Bridge RC6 Is Good To Go after the Intel OTC developers were spending months trying to figure out why for some Sandy Bridge systems this feature, which can significantly conserve power while the system is idling by dropping the supplied power to the integrated graphics processor, was causing stability issues and problems for a small number of systems. Intel has tried at several different times to enable RC6-by-default, but in the end it was always reverted due to such problems.

Intel remains confident that RC6 should be safe to have by default for the latest-generation Intel hardware (RC6 for Ivy Bridge is already on-by-default as they're confident it's working well there), at least using the "plain" RC6 that avoids the deepest power states. While they have been comfortable with RC6 for Sandy Bridge, the change to enable this hardware power-savings feature wasn't found in the exciting DRM pull for the Linux 3.4 kernel.

Eugeni Dodonov of Intel has now sent two patches to the mailing list for having this support merged.
Daniel Vetter and Chris Wilson noticed that the latest rc6 patches went missing in the latest drm merge requests. So I updated them to the latest Linus' tree, and improved the description a bit.

Those settings have received a huge testing on Ubuntu (thanks a lot Canonical!!), and so far it looks like they solve all the known issues on SNB with RC6 which were out there for the past months.

However, one can never be too sure, so the earlier we get them in the main kernel, the earlier we'll find out if there are still some bugs in the wild (with any luck, there won't be any). And with this, we'll complete the lets-try-rc6-by-default-one-more-time saga.

Eugeni Dodonov (2):
drm/i915: allow to select rc6 modes via kernel parameter
drm/i915: enable plain RC6 on Sandy Bridge by default
Meanwhile, Ubuntu 12.04 LTS with its Linux 3.2-based kernel continues to have RC6 enabled. Aside from the RC6 power-savings benchmarks shown in last month's article, there's some more results in Intel RC6 Support On The Sandy Bridge Desktop.

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. NVIDIA GeForce GTX 980: The Best GPU For Linux Gamers
  2. ROCCAT LUA: A Linux-Friendly Gaming Mouse
  3. Cheetah Mounts: The Affordable Way To Put Your TV On The Wall
  4. Scythe Mugen MAX
Latest Linux Articles
  1. Preview: Radeon Gallium3D Performance For CS:GO On Linux
  2. XWayland Linux Gaming Performance With GNOME Wayland On Fedora 21
  3. EXT4/Btrfs/XFS/F2FS Benchmarks On Linux 3.17
  4. Fedora 21 Alpha First Impressions: It's Great
Latest Linux News
  1. KDE Plasma 5.1 Now In Beta
  2. Systemd & Debian Were Most Popular In September
  3. Microsoft Announces... Windows 10 With A Start Menu
  4. Borderlands 2 Launches On Steam For Linux
  5. Debian Jessie Might Get Rid Of The kFreeBSD Port
  6. Fedora Might Try A New Scheduling Strategy For Its Releases
  7. AMD's Catalyst Working On A GLSL Shader Cache
  8. OpenMP 4.0 Offloading Is Closer For GCC 5
  9. Wayland Presentation Extension Added To Weston
  10. Intel Skylake Support Rolls Out To Mesa's DRM
Latest Forum Discussions
  1. New Group Calls For Boycotting Systemd
  2. FSF Issues Statement On Shellshock Bash Vulnerability
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  5. X.Org Is Looking For Some Female Help
  6. Advertisements On Phoronix
  7. NVIDIA Alerts Nouveau: They're Starting To Sign/Validate GPU Firmware Images
  8. Take the Steam Survey results with a grain of salt. It is flawed.