Bug 14066 - p4_clockmod unusable with ondemand even by manual choice
Summary: p4_clockmod unusable with ondemand even by manual choice
Status: REJECTED INSUFFICIENT_DATA
Alias: None
Product: Power Management
Classification: Unclassified
Component: cpufreq (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: cpufreq
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-08-26 00:01 UTC by Ryan Underwood
Modified: 2011-04-19 07:50 UTC (History)
3 users (show)

See Also:
Kernel Version: 2.6.30
Subsystem:
Regression: Yes
Bisected commit-id:


Attachments

Description Ryan Underwood 2009-08-26 00:01:58 UTC
The following patch:
[CPUFREQ] Prevent p4-clockmod from auto-binding to the ondemand governor

certainly seems like a good idea.  No reason to use an inefficient governor by default.  However, as a side effect, setting the transition latency to this value makes it impossible for the user to _choose_ to use ondemand even when it is the best choice for his environment.  On a Celeron-M processor, ondemand is useful for reducing heat output and keeping the fan from turning on all the time, and p4_clockmod is the only module that works for such processors.  Until 2.6.29 this was a very useful thing.
Comment 1 Ryan Underwood 2009-08-26 00:09:46 UTC
I guess I'm confused if the intent of this change was to disable p4_clockmod entirely for the purposes of eventually making it go away, or to merely disable it from being used by default.
Comment 2 Len Brown 2011-01-18 06:13:37 UTC
can you use p4-clockmod with userspace governor still?
Comment 3 Zhang Rui 2011-04-19 07:50:43 UTC
bug closed as there is no response from the bug reporter.
please re-open it if the problem still exists in the latest upstream kernel.

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