MWAIT... How is it's use decided?

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I have a p4 630 in a system that only supported through the 
P4 5xx series chips.  I've written a custom DSDT that added 
C-States[C1-C4] and P-States[2.8+3.0Ghz, with a little VID
drop], and have acpi-cpufreq working quite well with it.  

The only things I can think of left are getting MWAIT/C1E
working and TM2.  TM2 isn't a big concern of mine, as I
rarely get it hot, but C1E would be neat to enable.  I 
just can't figure out what to do to do it though.  If I
pass idle=mwait on the kernel command line, it disables 
acpi-cpufreq, or disables my custom DSDT table (not sure 
which).  But with idle=mwait, it works, but no cpufreq
or C-States.  can anyone provide a pointer as to what
to look at to fix this?

Pat Erley
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