http://bugzilla.kernel.org/show_bug.cgi?id=11878
------- Comment #13 from [EMAIL PROTECTED] 2008-11-03 01:51 -------
Hi, Martin
Thanks for the test and info.
From the acpidump it seems that the ACPI FAN device is related with the
power resource(FN00), in which the _ON/_OFF object is bogus.
> PowerResource (FN00, 0x00, 0x0000)
{
Method (_STA, 0, Serialized)
{
Store (0xF1, P80H)
Return (One) // It means that the FN00 is alwasy on. Of course
the ACPI FAN device will report that it is on.
}
Method (_ON, 0, Serialized)
{
Store (0xF1, P80H)
}
Method (_OFF, 0, Serialized)
{
Store (0xF0, P80H)
}
// The _ON/_OFF object definition is bogus.
}
In such case the /proc/acpi/fan/FAN/state is always on and the FAN device
is not controlled by ACPI FAN device. And it is controlled by BIOS.
And when the brightness is changed by the interface of
/sys/class/backlight/acpi_video0/brightness, the _BCM object will be evaluated,
in which the SMI is triggered. Maybe in such case the FAN is turned on/off by
BIOS.
So IMO this bug is related with BIOS.
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