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powernow-k8 problem

Dear all,

When trying to modprobe powernow-k8 I get the following:

  > modprobe powernow-k8
  FATAL: Error inserting powernow_k8 (/lib/modules/2.6.15-1-486/kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.ko): No such device
And in syslog I get:

  powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.50.4)
  powernow-k8: BIOS error - no PSB or ACPI _PSS objects

I have read about this problem and people suggest turning on Cool
'n Quiet in BIOS or/and update BIOS. I think I have tried these things...

  Kernel: 2.6.15-1-486 (Debian)
  CPU:    Athlon 64, 3000+, 2 GHz, Socket 754
  MB:     ASUS, K8V-MX updated with BIOS 0207 (originally 0204)

Do I need an amd64-compiled kernel?
Is it enough with BIOS setting "Cool N'Quiet" set to "Enabled"?

Any clues welcome, thanks in advance,

/Thomas L

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