New AMD CPUs To Support Power Monitoring With Linux 4.5
Written by Michael Larabel in AMD on 11 January 2016 at 07:30 AM EST. 2 Comments
AMD --
With the Linux 4.5 merge window's hwmon subsystem pull request is an update for new AMD Family 15h processors to support power monitoring.

With the hwmon update, the Family 15h Model 70h-7fh processors now support monitoring their power usage (in Watts) via the fam15h_power driver. I haven't been able to find any concrete information for what APU/CPUs technically cover this Family 15h 70h series, but anticipate it being either the rumored desktop Carrizo APUs or Zen. If anyone knows for sure, please let us know in the forums.

The fam15h_power driver has been around for a few years. I haven't tried the driver in a few kernel releases, but last time I did on some Bulldozer era CPUs the results were wildly inaccurate.

In some other good news, it seems AMD is finally officially claiming responsibility for this fam15h_power driver. Back in 2012 when AMD let go of some of their Linux kernel developers that included the maintainers of this AMD power driver. Over three years later, AMD engineer Huang Rui is officially taking over maintenance of this driver as of the Linux 4.5 kernel.

Huang Rui has also been working on separate patches for AMD accumulated power reporting support on Linux, which isn't part of today's pull request.

The hwmon pull request besides the fam15h_power driver update also has basic support for the NCT6683 on Mitac boards, a new pmbus client driver for the LTC3815, and removes the htu21 driver as it's now supported by the IIO subsystem.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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