[Bugme-new] [Bug 12476] New: Laptop fan always on, regardless of CPU temperature

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Sun Jan 18 03:56:29 PST 2009


http://bugzilla.kernel.org/show_bug.cgi?id=12476

           Summary: Laptop fan always on, regardless of CPU temperature
           Product: ACPI
           Version: 2.5
     KernelVersion: 2.6.27.7-134.fc10.i686
          Platform: All
        OS/Version: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Fan
        AssignedTo: acpi_power-fan at kernel-bugs.osdl.org
        ReportedBy: bonevivo at hotmail.com


Latest working kernel version:
not really sure

Earliest failing kernel version:
N/A

Distribution:
Fedora 10

Hardware Environment:
Samsung X22
Intel(R) Core(TM)2 Duo CPU T7500  @ 2.20GHz

Software Environment:
kernel: 2.6.27.7-134.fc10.i686
acpid: acpid-1.0.6-9.fc10.i386
/proc/acpi/info: Version 20080609

Problem Description:
The laptop fan runs constantly even if the CPU temperature is low (36°). The
fan seems to be controlled by the BIOS which runs it at a constant RPM all the
time and not by the kernel. With Windows the fan is controlled depending on the
use and temperature.
There is 1 entry in /proc/acpi/fan/ - FAN0 and its state is "off". However the
laptop's fan is actually running.

Steps to reproduce: 
1. Boot Fedora 10

I think that this was working with fedora 8 and 2.6.26 kernels, but I am not
100% sure. I will be glad to provide any additional information that might be
needed.


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