Bug 195877 - cpuspeed misses fallback for ACPI-only speed stepping
cpuspeed misses fallback for ACPI-only speed stepping
Product: Fedora
Classification: Fedora
Component: cpuspeed (Show other bugs)
i386 Linux
medium Severity low
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Assigned To: Dave Jones
Depends On:
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Reported: 2006-06-19 02:35 EDT by Peter Bieringer
Modified: 2015-01-04 17:27 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2006-06-20 01:55:29 EDT
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Description Peter Bieringer 2006-06-19 02:35:17 EDT
Description of problem:
While looking for a tool which uses ACPI speed stepping I found that cpuspeed
doesn't support this.

Version-Release number of selected component (if applicable):

Additional info:
I found a nice tool called "scaler" which does the job:

It uses /proc/acpi/processor/CPU0/throttling                                   
  for selecting CPU speed.

Can this code be implemented in "cpuspeed" as a fallback?
Comment 1 Dave Jones 2006-06-20 01:55:29 EDT
throttling != speed scaling, and most of the time, it's a really bad idea.

The upstream ACPI maintainers have also talked about removing this in future
kernels, so adding things depending on it, is also a bad idea.
Comment 2 Peter Bieringer 2006-06-20 02:03:54 EDT
Ok, I understand, also I've connected a AC power meter and have to recognize,
that throtteling won't save any power at all...so "scaler" is at least on this
desktop PC useless.

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