From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marc Singer <elf@buici.com>
Subject: Re: Athlon 64 complains of frequency mismatch
Date: Tue, 22 Jun 2004 10:59:05 -0700
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On Tue, Jun 22, 2004 at 07:11:03PM +0200, Dominik Brodowski wrote:
> Also, are there any entries in the BIOS you can toggle which might be
> related to "Cool&Quiet", "PnP-capable OS", ...?

Bingo.  There is a Cool&Quiet enable option.  The dump module now
produces this:

    ACPI: Processor [CPU1] (supports C1, 16 throttling states)
    number of states: 10
    acpi_pdump: P0: 2000 MHz, 89000 mW, 125 uS s:0x8c c:0xa020288c
    acpi_pdump: P1: 1800 MHz, 66000 mW, 125 uS s:0x18a c:0xa020298a
    acpi_pdump: P2: 1800 MHz, 66000 mW, 125 uS s:0x18a c:0xa020298a
    acpi_pdump: P3: 1800 MHz, 66000 mW, 125 uS s:0x18a c:0xa020298a
    acpi_pdump: P4: 1800 MHz, 66000 mW, 125 uS s:0x18a c:0xa020298a
    acpi_pdump: P5: 800 MHz, 35000 mW, 125 uS s:0x280 c:0xa0202a80
    acpi_pdump: P6: 800 MHz, 35000 mW, 125 uS s:0x280 c:0xa0202a80
    acpi_pdump: P7: 800 MHz, 35000 mW, 125 uS s:0x280 c:0xa0202a80
    acpi_pdump: P8: 800 MHz, 35000 mW, 125 uS s:0x280 c:0xa0202a80
    acpi_pdump: P9: 800 MHz, 35000 mW, 125 uS s:0x280 c:0xa0202a80
    control_register:
    130 12 127 0 0 0 0
    status_register:
    130 12 127 0 0 0 0

And the powernow-p8 driver loads.

Perhaps this is an addition to the FAQ:

 Q609: AMD Cool&Quiet CPU won't load the powernow-k? driver.  Why?

 A609: The powernow driver gets it's information about processor
       states from the BIOS's reported ACPI control data.  If the
       powernow driver won't load it may be because Cool&Quiet hasn't
       been enabled in the BIOS.  Make sure that BIOS settings for a
       PowerNow or a Cool&Quiet option are enabled.

Or, maybe the driver should output a kernel message about BIOS
settings.

Cheers.