Kind of difficult to say from the info you provided:
1) What mark/model of CPU?
2) Is there any over clocking applied (either manually or using one of the
fancy BIOS options)?
3) Do you use any other frequency scaling daemon beside the stock powernowd?
4) Do you use a self-compiled or non-stock kernel?
5) Please provide an lspci -vvnn log.
6) Provide also, if any, the settings/modifications you have applied to the
daemon (also, if using powernowd, your /etc/default/powernowd if any).
If the answer to 3) and 4) is no, pls. provide also the output of the
following commands (need to be run as root, I assume you only have one
cpu/core):
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
cat /proc/cpuinfo | grep "cpu MHz"
** Changed in: Ubuntu
Sourcepackagename: None => powernowd
Status: Unconfirmed => Needs Info
--
CPU monitor reports unrealistic frequencies
https://launchpad.net/bugs/94042
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