Arch Linux

Arch Linux i686, fresh install. 2.6.31 kernel (i also tried other kernels like ZEN).
Computer: Fujitsu-Siemens AMILO L7300

Problem:

When I modprobe p4-clockmod, dmesg says:
p4-clockmod: Warning: Pentium M detected. The
acpi_cpufreq module offers voltage scaling in addition of frequency
scaling. You should use that instead of p4-clockmod, if possible.

When using p4-clockmod, my 1.73GHZ will be limited to 600MHz, so instead I try to modprobe acpi-cpufreq, but it gives an error:

[root@archijs build]# modprobe acpi-cpufreq
FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.31-ARCH/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko): No such device

cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.73GHz (Dothan)
stepping : 8
cpu MHz : 598.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts est tm2
bogomips : 1197.07
clflush size : 64
power management:

/proc/config.gz:
#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=m
# CONFIG_CPU_FREQ_DEBUG is not set
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=m
CONFIG_CPU_FREQ_GOV_ONDEMAND=m
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m

#
# CPUFreq processor drivers
#
CONFIG_X86_ACPI_CPUFREQ=m
CONFIG_X86_POWERNOW_K6=m
CONFIG_X86_POWERNOW_K7=m
CONFIG_X86_POWERNOW_K7_ACPI=y
CONFIG_X86_POWERNOW_K8=m
CONFIG_X86_GX_SUSPMOD=m
CONFIG_X86_SPEEDSTEP_CENTRINO=m
CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE=y
CONFIG_X86_SPEEDSTEP_ICH=m
CONFIG_X86_SPEEDSTEP_SMI=m
CONFIG_X86_P4_CLOCKMOD=m
CONFIG_X86_CPUFREQ_NFORCE2=m
CONFIG_X86_LONGRUN=m
CONFIG_X86_LONGHAUL=m
CONFIG_X86_E_POWERSAVER=m
CONFIG_X86_CPUFREQ_EEEPC900=m

#
# shared options
#
CONFIG_X86_SPEEDSTEP_LIB=m
CONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK=y
CONFIG_CPU_IDLE=y
CONFIG_CPU_IDLE_GOV_LADDER=y
CONFIG_CPU_IDLE_GOV_MENU=y

[root@archijs build]# modprobe speedstep-lib
[root@archijs build]# modprobe speedstep-ich
FATAL: Error inserting speedstep_ich (/lib/modules/2.6.31-ARCH/kernel/arch/x86/kernel/cpu/cpufreq/speedstep-ich.ko): No such device
[root@archijs build]# modprobe speedstep-centrino
FATAL: Error inserting speedstep_centrino (/lib/modules/2.6.31-ARCH/kernel/arch/x86/kernel/cpu/cpufreq/speedstep-centrino.ko): No such device

[root@archijs build]# ls /sys/devices/system/cpu/cpu0/
cpuidle crash_notes thermal_throttle topology
[root@archijs build]# dmesg | grep throttling
ACPI: Processor [CPU0] (supports 8 throttling states)
[root@archijs build]# dmesg | grep acpi
pata_acpi 0000:00:11.1: power state changed by ACPI to D0
pata_acpi 0000:00:11.1: PCI INT A -> Link[LNKA] -> GSI 7 (level, low) -> IRQ 7
pata_acpi 0000:00:11.1: VIA VLink IRQ fixup, from 0 to 7
pata_acpi 0000:00:11.1: PCI INT A disabled
[root@archijs build]# dmesg | grep cpu
KERNEL supported cpus:
NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 nr_node_ids:1
[<c12ff1aa>] ? identify_cpu+0x377/0x386
[<c1429dc9>] ? identify_boot_cpu+0xa/0x1e
cpuidle: using governor ladder
cpuidle: using governor menu
[root@archijs build]# cat /proc/acpi/processor/CPU1/throttling
cat: /proc/acpi/processor/CPU1/throttling: No such file or directory
[root@archijs build]# cpufreq-info
cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU

On Ubuntu Karmic/Jaunty all works fine. It uses centrino driver (cpufreq-info).
BIOS is up to date -- i also checked it's settings (tried 'Restore Defaults'), but didn't found anything that is related to SpeedStep or ACPI Tables..