Bug 116308 - powersaved doesn't have modules for p4
Summary: powersaved doesn't have modules for p4
Status: RESOLVED INVALID
: 188848 (view as bug list)
Alias: None
Product: SUSE LINUX 10.0
Classification: openSUSE
Component: Mobile Devices (show other bugs)
Version: Preview 4
Hardware: i686 All
: P5 - None : Normal
Target Milestone: ---
Assignee: Holger Macht
QA Contact: E-mail List
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Depends on:
Blocks:
 
Reported: 2005-09-10 03:44 UTC by Renan Fernandes
Modified: 2006-06-29 15:03 UTC (History)
3 users (show)

See Also:
Found By: Beta-Customer
Services Priority:
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Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description Renan Fernandes 2005-09-10 03:44:26 UTC 
the file /etc/init.d/powersaved doesn't have the CPUFREQ_MODULES for 
p4_clockmod
so, adding the module p4_clockmod to CPUFREQ_MODULES variable should fix it
Comment 1 Forgotten User ZhJd0F0L3x 2005-09-10 22:40:28 UTC 
no. This module is useless, it does not do anything useful wrt power saving.

Sorry to say this, but if you want power saving, you need a processor that can
do frequency scaling, not clock modulation. So we will not add this module to
the default list unless someonce comes up with a very good reason (and
measurements) that support this.
Comment 2 Thomas Renninger 2005-09-12 07:08:38 UTC 
The p4_clockmod module does throttling, not cpufreq.
We use another interface for this.
Default should be: if machine is idle for 10s -> machine is throttled by 50 %.
Use:
powersave -T
and use
Yast power-management module to allow throttling in performance scheme.
Or just edit
/etc/sysconfig/powersave/scheme_performance
ALLOW_THROTTLING="no" -> "yes"
Comment 3 Holger Macht 2006-06-29 14:07:28 UTC 
*** Bug 188848 has been marked as a duplicate of this bug. ***
Comment 4 Thomas Renninger 2006-06-29 15:03:54 UTC 
For anyone who cares about the p4-clockmode module:
This module is deprecated!
It is also discussed to let this module vanish from mainline kernel.

BTW: This module does throttling. Throttling is not intended for runtime power saving. It is intended for thermal reduction when the machine reaches very high temperatures. The powersaving/performance ratio is very poor. If one really cares about powersaving one should look at real cpufreq techniques like (Enhanced)SpeedStep or PowerNow (on x86(_64)).

Anyone who's bug ends up here as a duplicate: Please search the database for existing bugs first.