i386/106850: powernow0 attach returned 6

[David]

>Number:         106850
>Category:       i386
>Synopsis:       powernow0 attach returned 6
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 18 06:00:32 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     David
>Release:        RELENG_6
>Organization:
>Environment:
FreeBSD aragorn 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #30: Sun Dec 17 01:08:30 PST 2006     i386
>Description:
I can't get powerd working on an Athlon X2.  

in rc.conf I have:
powerd_enable="YES"
powerd_flags="-a adaptive -n adaptive -r 25"

in loader.conf I have:
cpufreq_load="YES"

dmesg gives me:

Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-PRERELEASE #30: Sun Dec 17 01:08:30 PST 2006
    dbmoler at aragorn:/usr/obj/usr/src/sys/ARAGORN
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ (1999.79-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x20fb1  Stepping = 1
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,S
SE2,HTT>
  Features2=0x1<SSE3>
  AMD Features=0xe2500800<SYSCALL,NX,MMX+,FFXSR,LM,3DNow+,3DNow>
  AMD Features2=0x3<LAHF,CMP>
  Cores per package: 2
real memory  = 1072562176 (1022 MB)
avail memory = 1040416768 (992 MB)
ACPI APIC Table: <VIAK8T AWRDACPI>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
ioapic0: Changing APIC ID to 2
ioapic0 <Version 0.3> irqs 0-23 on motherboard
bktr_mem: memory holder loaded
ath_hal: 0.9.17.2 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
acpi0: <VIAK8T AWRDACPI> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
cpu0: <ACPI CPU> on acpi0
powernow0: <Cool`n'Quiet K8> on cpu0
device_attach: powernow0 attach returned 6
cpu1: <ACPI CPU> on acpi0
powernow1: <Cool`n'Quiet K8> on cpu1
device_attach: powernow1 attach returned 6
acpi_button0: <Power Button> on acpi0

I've seen other reports to this effect but no solution.  I had this working a while ago with the same motherboard, but different cpu.  Not sure when it stopped working, but it was a while ago.
>How-To-Repeat:
Try to get powerd working on my hardware.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: