http://bugzilla.kernel.org/show_bug.cgi?id=8245
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
Summary|acpi-cpufreq not working on |acpi-cpufreq does not load -
|Pentium M Dothan |Pentium M processor 1.60GHz
------- Additional Comments From [EMAIL PROTECTED] 2007-03-25 20:30 -------
The ACPI DSDT does not contain P-state information (no _PCT, _PSS, _PPC)
but it does load an SSDT at run-time based on the _PDC bits:
Processor (CPU1, 0x01, 0x00000410, 0x06)
{
OperationRegion (SSDT, SystemMemory, 0xFFFF0000, 0xFFFF)
Name (NCPU, 0x00)
Name (TYPE, 0x80000000)
Name (HNDL, 0x80000000)
Method (_PDC, 1, NotSerialized)
{
CreateDWordField (Arg0, 0x08, DAT0)
Store (DAT0, TYPE)
If (LEqual (NCPU, 0x02))
{
If (LEqual (And (TYPE, 0x0A), 0x0A))
{
OperationRegion (PMRG, SystemIO, \PMBS, 0x50)
Field (PMRG, ByteAcc, NoLock, Preserve)
{
Offset (0x41),
DEV4, 1,
DEV5, 1,
DEV6, 1,
DEV7, 1,
STS4, 1,
STS5, 1,
STS6, 1,
STS7, 1
}
Store (0x01, STS7)
Store (0x01, DEV7)
Load (SSDT, HNDL)
}
}
}
}
The code in linux-2.6.21-rc5 should print out the header of each table,
including a dynamically loaded SSDT. Can you attach the complete output
from dmesg -s 64000 fro 2.6.21-rc5 or later?
We can also probably peek at the SSDT with acpidump on the physical
addresses to confirm that it includes the needed P-state objects.
But I suspect the real problem here is that the _PDC bits are not
causing the needed SSDT to get loaded in the first place.
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