Bug 718380

Summary: ASUS 1215N : Cannot change CPU governors
Product: [Fedora] Fedora Reporter: Turgut Kalfaoglu <turgut>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 15CC: aquini, gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda
Target Milestone: ---Keywords: Reopened
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Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2011-07-11 22:03:39 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Turgut Kalfaoglu 2011-07-02 05:47:02 UTC 
As discussed in http://forums.fedoraforum.org/showthread.php?t=265998  ,
the CPU governor can only be set to "performance" or "userspace". Attempts at adding new ones appear to work, but are not switchable.

Here is the command log that explains this:

# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
userspace
# modprobe cpufreq_performance cpufreq_ondemand cpufreq_conservative cpufreq_userspace
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
userspace
# echo conservative > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
#
 
No other system messages are dumped anywhere - that I can find.
Comment 1 Dave Jones 2011-07-11 21:35:53 UTC 
your processor doesn't support frequency scaling.
Comment 2 Turgut Kalfaoglu 2011-07-11 21:46:57 UTC 
Thanks but  I can change my CPU frequency over a range of tenfold using "cpuspeed".
Comment 3 Dave Jones 2011-07-11 22:03:39 UTC 
No, you can't.  It's just eating cycles, doing no power saving.

(which is one reason it's going away in f16)