http://bugzilla.kernel.org/show_bug.cgi?id=12830
------- Comment #17 from yakui.z...@intel.com 2009-03-18 19:14 -------
Hi, Martin
It seems that this issue is related with BIOS. When the power is switched
between AC and DC, the 0x80 notification event will be sent to the processor
CPU. In such case the driver will re-evaluate the _PPC object and apply the new
processor CPU frequency limit.
From the acpidump it seems that the _PPC object is defined as the
following:
>Method (_PPC, 0, NotSerialized)
{
Store (SMI (0xAD, 0x00), Local0)
Return (Local0)
}
At the same time in course of ACPI initialization the MIS3 object will be
used in the _INI object and the SMI is triggered.
> Method (SOST, 0, NotSerialized)
{
SX10 ()
SX30 (0x0A)
OSID ()
SX30 (MIS3)
SX11 ()
SX12 ()
}
And the MIS3 is related with the boot option of "acpi_osi". If the
acpi_osi="!Windows 2006" is added, the MIS3 will be 0x10. Otherwise it will be
0x20. Maybe the behaviour will be different when the different MIS3 is passed
to BIOS.
If so, this issue will be different with that in bug 9919.
And What Rui said is right. The boot option of "processor.ignore_ppc" can
workround this issue.
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