Intel's Idle Driver Supports Broadwell With Linux 3.17
Written by Michael Larabel in Intel on 16 August 2014 at 07:56 AM EDT. 2 Comments
The native hardware cpuidle driver for Intel CPUs now supports the upcoming Broadwell processors with Linux 3.17.

Len Brown of Intel sent in a few basic tweaks for the idle drivers at the end of the Linux 3.17 merge window. One commit disables Bay Trail's Core and Module C6 auto-demotion while the other main patch adds Broadwell support to the intel_idle driver.

The patch for Broadwell intel_idle support by Len explains, "Broadwell (BDW) is similar to Haswell (HSW), the preceding processor generation. Currently, the only difference in their C-state tables is that PC3 max exit latency is 33usec on HSW and 40usec on BDW."

The pull request can be found on the kernel mailing list. Intel started shipping their Broadwell-Y processors and you can expect to find them in ultra-portables by this holiday season and there should be great Linux support for this successor to Haswell.
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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 Twitter or contacted via MichaelLarabel.com.

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