It seems like all of you are using an amd64 kernel. So this looks like
bug 111375.
Can you confirm this?
Please provide the output of:
$ sudo modprobe -r powernow-k8
$ sudo modprobe powernow-k8
$ dmesg | grep powernow
** Changed in: powernowd (Ubuntu)
Importance: Undecided => Medium
Assignee: (unassigned) => dAniel hAhler (blueyed)
Status: New => Incomplete
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Error in powernowd startup script, "Directory nonexistent"
https://bugs.launchpad.net/bugs/85946
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