Unable to load powernow-k8 module

Weird.  My AMD Opteron is unable to load the powernow-k8 modules:
[darose@darsys9 kernel26]$ sudo modprobe powernow-k8
Password:
FATAL: Error inserting powernow_k8 (/lib/modules/2.6.26-ARCH/kernel/arch/x86/kernel/cpu/cpufreq/powernow-k8.ko): No such device
dmesg shows the following:
powernow-k8: Found 1 Dual Core AMD Opteron(tm) Processor 165 processors (2 cpu cores) (version 2.20.00)
powernow-k8: ACPI Processor support is required for SMP systems but is absent. Please load the ACPI Processor module before starting this driver.
powernow-k8: ACPI Processor support is required for SMP systems but is absent. Please load the ACPI Processor module before starting this driver.
But the processor module is already loaded:
[darose@darsys9 kernel26]$ lsmod
Module Size Used by
thermal 20512 0
freq_table 6400 0
processor 39744 1 thermal
Anyone have any idea what gives?
Thanks,
DR

I had a similar problem with the acpi-cpufreq module.  Read about it here
graysky wrote:
I figured it out!  I took a clue from my /var/log/dmesg
[ 4.633657] [Firmware Bug]: BIOS needs update for CPU frequency support
[ 4.633718] ACPI Error (psloop-0136): Found unknown opcode 20 at AML address ffff88012d27c633 offset 4F, ignoring [20080926]
[ 4.633722] ACPI Error (psloop-0136): Found unknown opcode 6F at AML address ffff88012d27c638 offset 54, ignoring [20080926]
[ 4.633726] ACPI Error (psloop-0136): Found unknown opcode 20 at AML address ffff88012d27c63c offset 58, ignoring [20080926]
[ 4.633729] ACPI Error (psloop-0136): Found unknown opcode 6F at AML address ffff88012d27c640 offset 5C, ignoring [20080926]
That line that reads, Firmware Bug: BIOS needs update for CPU frequency support was really bugging me.  So I took a risk, d/l'ed the latest BIOS for my board, flashed, reset all my custom BIOS settings, and rebooted into my new kernel.  I'm now able to use acpi-cpufreq and scaling works smoothly
Thanks for all the advice.
Or... it could be that you aren't supposed to use the powernow-k8 module w/ your chip.  From what I understand all Opty chips should use it... have you tried to modprobe acpi-cpufreq and see if it works?
Last edited by graysky (2009-04-22 19:49:29)

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