Bug 4061 - fan will start when cpu is hot but will never stop, even if cpu is cold an fan blows cold air.
Summary: fan will start when cpu is hot but will never stop, even if cpu is cold an fa...
Status: CLOSED CODE_FIX
Alias: None
Product: ACPI
Classification: Unclassified
Component: Power-Fan (show other bugs)
Hardware: i386 Linux
: P2 normal
Assignee: Konstantin Karasyov
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2005-01-18 14:14 UTC by Dimitris
Modified: 2007-02-15 22:13 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.10-1.741_FC3
Subsystem:
Regression: ---
Bisected commit-id:

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Description Dimitris 2005-01-18 14:14:30 UTC 
Distribution: Fedora Core 3
Hardware Environment: IBM ThinkPad A31p
Software Environment: Fedora Core 3 + kernel 2.6.10-1.741_FC3
Problem Description:

fan will start when cpu is hot but will never stop, even if cpu is cold an fan
blows cold air.

i understand that this machine may not allow control of the fan via ACPI, though
it seems weird that 'something' makes the fan start, but that unknown
'something' can't stop the fan.

its interesting that Windoze has a special power management driver called "IBM
PM" driver thats required to install. Maybe IBM uses some custom method to
control the fan?


Steps to reproduce:

boot, wait for fan to start, fan never stops.
Comment 1 Dimitris 2005-03-07 02:29:45 UTC 
*bump*
Comment 2 John Elliott Martin 2005-04-25 11:54:30 UTC 
I am having this same problem using kernel 2.6.11.4-20050418133015-default 
running on an Averatec 3300 laptop (Intel 855GM chipset).
Comment 3 Len Brown 2005-08-17 15:35:10 UTC 
still an issue in 2.6.13?
Comment 4 Dimitris 2005-09-30 01:18:20 UTC 
I think this bug has been fixed in 2.6.13-1.1526_FC4 on Fedora Core 4. The CPU
will now lower its speed as expected.
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