Bug: Pentium M not always detected by CPUFREQ

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Hi !

One module thinks that I have a Pentium M, the other doesn't. 
Which module is right?

# modprobe p4-clockmod
p4-clockmod: Warning: Pentium M detected. The speedstep_centrino 
module offers voltage scaling in addition of frequency scaling. 
You should use that instead of p4-clockmod, if possible.
p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available

Okay, so I'll try that:

# rmmod p4-clockmod
# modprobe speedstep-centrino
FATAL: Error inserting speedstep_centrino 
No such device

# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 9
model name      : Intel(R) Celeron(R) processor            600MHz
stepping        : 5
cpu MHz         : 598.093
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr mce cx8 apic sep mtrr 
pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 tm pbe
bogomips        : 1196.88

So far I can only say that speedstep-centrino doesn't have an 
entry for a CPU with a mere 600 MHz. May this be the problem?
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