[ACPI-sppt] m2400n: /proc/acpi/processor/CPU1/performance

Hello,

should writing to 
/proc/acpi/processor/CPU1/performance 
work on the ASUS m2400n ?
How can I use speed step ?

I tried

echo -n 6 > /proc/acpi/processor/CPU1/performance

but I always get

cat  /proc/acpi/processor/CPU1/performance
state count:             8
active state:            P0
states:
   *P0:                  1600 MHz, 32000 mW, 10 uS
    P1:                  1600 MHz, 32000 mW, 10 uS
    P2:                  1600 MHz, 32000 mW, 10 uS
    P3:                  1600 MHz, 32000 mW, 10 uS
    P4:                  1600 MHz, 32000 mW, 10 uS
    P5:                  1400 MHz, 28000 mW, 10 uS
    P6:                  1200 MHz, 24000 mW, 10 uS
    P7:                  1000 MHz, 20000 mW, 10 uS


thanks a lot,
alex


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