Bug 484143 - cpu frequency scales down under load despite being told not to
cpu frequency scales down under load despite being told not to
Status: CLOSED NOTABUG
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
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low Severity medium
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
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Reported: 2009-02-04 18:26 EST by David Nielsen
Modified: 2009-02-04 18:43 EST (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-02-04 18:43:32 EST
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Description David Nielsen 2009-02-04 18:26:38 EST
Description of problem:
I am seeing a problem on my laptop on both F10 current and rawhide when load is put on the CPU, say by playing a video, the CPU scales down from 1.73GHz to 800Mhz despite being told to stay at 1.73 via the gnome cpu freq applet. 

This turns the desktop experience horribly choppy, it is impossible to watch a movie when it constantly is turned into a slideshow.

The CPU reports as:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 CPU         T5300  @ 1.73GHz
stepping	: 2
cpu MHz		: 1733.000
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
bogomips	: 3457.69
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 CPU         T5300  @ 1.73GHz
stepping	: 2
cpu MHz		: 1733.000
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 1
cpu cores	: 2
apicid		: 1
initial apicid	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
bogomips	: 3457.93
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:


Version-Release number of selected component (if applicable):
kernel-2.6.29-0.74.rc3.git3.fc11.x86_64

How reproducible:
100%

Steps to Reproduce:
1. put load on the cpu, say by playing a video (HD content is good) or converting audio files. 

Actual results:
watch as the rest of the desktop is turned into molasses

Expected results:
smooth sailing

Additional info:
Comment 1 David Nielsen 2009-02-04 18:43:32 EST
probably overheating, I just measured and for some reason the CPU temp has climbed to +80C which it has never done before. I am guessing the fan is clogged or something

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