Bug 508761 - System runs very hot with 2.6.31 kernels
System runs very hot with 2.6.31 kernels
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
x86_64 Linux
low Severity high
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Assigned To: John Feeney
Fedora Extras Quality Assurance
Depends On:
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Reported: 2009-06-29 14:24 EDT by birger
Modified: 2013-01-10 02:12 EST (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-07-02 23:19:12 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description birger 2009-06-29 14:24:29 EDT
Description of problem:
I'm running on HP EliteBook 2530p with Fedora Rawhide x86_64. 4GB RAM and 80GB SSD

When I boot 2.6.31.* the fan comes on rather quickly, and the system gets uncomfortably hot. Running powertop I can make some observations
I usually see most of the cpu time in C6 state, now it's almost 50% C0.

I have almost 500 wakeups/sec, and > 90% are kernel core, where it used to be about a fifth, and most due to wlan driver.

Version-Release number of selected component (if applicable): 2.6.31

How reproducible: All kernels in this series I have tried so far.

Steps to Reproduce:
1. Boot a 2.6.31 kernel
2. Look at powertop output
3. Feel the heat
Actual results:

Expected results:

Additional info:
Comment 1 birger 2009-07-01 15:01:29 EDT
I just installed the 2.6.31-0.35.rc1.git5.fc12.x86_64 kernel, and the power usage is back to normal.

At the moment I have 87% in state C6 even if I am typing this in firefox running in wine. Power usage balances around 10W again. No fans running. Silence... :-)

Thanks for a quick fix

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