http://bugzilla.kernel.org/show_bug.cgi?id=11878





------- Comment #17 from [EMAIL PROTECTED]  2008-11-06 01:30 -------
Understand what you said.
   In the boot phase the Linux ACPI will try to enumerate all the ACPI devices
and  load the corresponding driver for them. As there exists the ACPI FAN
device, the ACPI fan driver will be loaded. So the following message is
reported. In such case the userspace application or the other module can
control the FAN device . But unfortunately the FAN control method is bogus. The
FAN device can't be controlled by ACPI FAN interface. It is not the ACPI fault.
   When you try to change the LCD brightness, the _BCM object will be
evaluated, in which the SMI is triggered. In such case OS can't know what is
changed by SMI. 

   So IMO this is a BIOS bug. And Linux ACPI can do nothing about it. 


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