Power management problems

[Anne Wilson]

I have to shut down my fedora computer when I'm not using it, as I have power 
management problems.  Logwatch tells me

 WARNING:  Kernel Errors Present
    powernow-k8: BIOS error - no PSB or ACPI ...:  3 Time(s)

and drives never spin down, or any other kind of management cuts in.  The full 
report in messages is

Jul 22 10:08:57 david kernel: powernow-k8: Found 1 AMD Hammer Family 
processor - Model Unknown processors (1 cpu cores) (version 2.20.00)
Jul 22 10:08:57 david kernel: powernow-k8: BIOS error - no PSB or ACPI _PSS 
objects

I have no limiter in grub:

title Fedora (2.6.25.10-86.fc9.i686)
        root (hd0,0)
        kernel /vmlinuz-2.6.25.10-86.fc9.i686 ro root=/dev/VolGroup00/LogVol00 
rhgb quiet
        initrd /initrd-2.6.25.10-86.fc9.i686.img

Is there anything I can do to improve the situation?

Anne
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