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Dynamic Refresh Rate Switching For Intel's DRM Driver

Intel

Published on 18 December 2013 09:19 AM EST
Written by Michael Larabel in Intel
6 Comments

A patch-set has been published that provides Dynamic Refresh Rate Switching (DRRS) support for Intel's DRM Linux graphics driver.

Dynamic Refresh Rate Switching is a power-saving feature that allows for the graphics driver to switch between low and high refresh rates based upon the system's usage scenario. If the system can get by with a lower refresh rate in an idle or low-usage desktop setting over say gaming where a higher refresh rate is preferred, the system will dynamically move down to the lower refresh-rate.

Dynamic Refresh Rate Switching is dependent upon having an internal embedded DisplayPort (eDP) panel and support for DRRS must be advertised by the panel's EDID data.

In the patch-set by Intel's Vandana Kannan, the Intel DRM driver can now support idleness detection within the display driver and switch to the lower advertised refresh rate. More details can be found via the patch-set on the intel-gfx mailing list that could make it into the Linux 3.14 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 .
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