CPU Freq problem FC6

[Frank Pineau]

I have a P4 notebook (Compaq NX9010-Pavilion ze8500) with which I'm
having CPU frequency problems.  It's a 2.8GHz processor, but I can't
seem to get it above 692MHz.  

[root at liquidity /]# cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Mobile Intel(R) Pentium(R) 4     CPU 2.80GHz
stepping        : 9
cpu MHz         : 692.000
cache size      : 512 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 pae mce cx8 mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up cid xtpr
bogomips        : 5789.47

[root at liquidity /]# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 
668000 692000 

[root at liquidity /]$ dmesg |grep CPU
Initializing CPU#0
CPU 0 irqstacks, hard=c07ae000 soft=c078e000
CPU: After generic identify, caps: bfebf9ff 00000000 00000000 00000000 00004400 00000000 00000000
CPU: After vendor identify, caps: bfebf9ff 00000000 00000000 00000000 00004400 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Hyper-Threading is disabled
CPU: After all inits, caps: bfebf1ff 00000000 00000000 00000080 00004400 00000000 00000000
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
CPU0: Intel Mobile Intel(R) Pentium(R) 4     CPU 2.80GHz stepping 09
Brought up 1 CPUs
speedstep-smi: you're trying to use this cpufreq driver on a Pentium 4-based CPU. Most likely it will not work.
ACPI: CPU0 (power states: C1[C1] C2[C2])

Note the speedstep-smi line.  

I've tried disabling cpuspeed and also tried manually selecting frequency.

Personally, I'd prefer to have scaling working only on battery power, but I'll settle for getting it to work *at all*.

Any suggestions?