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

[Joshua Kramer]

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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