Same problem here, I think. Worked in Intrepid.

$ cpufreq-info  
CPU 0:
(...)
current policy: frequency should be within 400 MHz and 3.20 GHz.
The governor "performance" may decide which speed to use
within this range.
(...)
CPU 1:
current policy: frequency should be within 400 MHz and 3.20 GHz.
The governor "performance" may decide which speed to use
within this range.
(...)

$ sudo cpufreq-set -c0 -g ondemand
$ sudo cpufreq-set -c1 -g ondemand

cpufreq-info still lists performance as the gov in charge...
No errors, no warnings, just no apparent change of governor. 

$ cpufreq-info |grep "available cpu"
  available cpufreq governors: conservative, ondemand, userspace, powersave, 
performance

$ lsmod |grep p4_
p4_clockmod             4164  1

-- 
frequency scaling on P4 does not work
https://bugs.launchpad.net/bugs/460064
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