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Intel Still Working On Haswell Runtime Power Management

Intel

Published on 23 November 2013 09:52 AM EST
Written by Michael Larabel in Intel
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Intel Linux developers are still working on a Haswell run-time power management feature for their open-source graphics driver.

Paulo Zanoni published a set of 19 patches this week that provide Haswell run-time power management support for putting the graphics device into a D3 power-savings state. While Haswell has been out for months and the developers are already working on Broadwell, this Haswell PM feature is only coming after the developers had been working on similar support for Bay Trail / Valley View graphics.

This runtime power management support can be enabled by writing "auto" to a new sysfs file for the Intel DRM graphics driver. While the 19 patches are out there now changing several hundred lines of code, still to be worked on for this patch-set is merging PC8 and runtime D3, support for PC8/D3 on DPMS (Display Power Management Signalling), and support for other platforms (including possibly Ivy Bridge).

The Intel Haswell runtime power management feature will hopefully be merged for the Linux 3.14 kernel; many more details can be found from the mailing list patch-set.

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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