powernow-k8 and thermal / voltage data

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Hi,
    I have several servers with Opteron processors running RHEL v4. 
    I've successfully gotten CPU frequency scaling working (which I
    tested by looking at the cpu frequency before and during running a
    CPU intensive task).  However, there are currently 2 issues:

    1) cat /proc/acpi/thermal_zone/* is empty (there's nothing under the
    thermal_zone directory)

    2) I get the impression that the voltage doesn't change even though
    the CPU frequency changes.  Is there any way to check for this? 
    Thanks.

Thanks for your help.
-- 
  Mathew Brown
  mathewbrown@xxxxxxxxxxx

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