[colug-432] How can I tell what driver cpu scaling uses?

[Joshua Kramer]

Of course, using acpi has its drawbacks.  Depending on processor
capability, sometimes a longer-running task at low frequency uses more
power than a fast task at a high frequency.  The intel_pstate driver knows
about this and accomodates.  The issue is that intel_pstate does not use
the same governor options as acpi; with intel_pstate, there are only
powersave and performance.

So in this case, the "right" solution is for me to go hunt down the
configurations for the cpuspeed daemon and modify it to not try to set the
scaling_governor to something that is not allowed.

This post has more information:
https://bbs.archlinux.org/viewtopic.php?pid=1294415#p1294415



On Thu, Jan 16, 2014 at 12:25 PM, Joshua Kramer <joskra42.list at gmail.com>wrote:

> So I found out that starting with 3.4 I think, the kernel defaults to
> using the intel_pstate driver instead of acpi_pstate.  If using the
> intel_pstate driver causes issues (as it did with me), then add this to the
> kernel boot parameters:
>
> intel_pstate=disable
>
> After doing this, my copy of the 3.12 kernel now uses the acpi driver, and
> things work as they should.
>
>
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