fan speed for given temperatures

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Beginning with kernel 2.6.38 (might be .37 too) I observed, that the fan speed 
is often much higher than before. I'm wonder why b/c the temperatures itself 
seems to be not so high. With this alias :

tfoerste@n22 ~ $ alias temp
alias temp='cat /proc/acpi/ibm/thermal /proc/acpi/ibm/fan | sed 
'\''s/-128/./g'\'''

I got within few seconds :

tfoerste@n22 ~ $ temp
temperatures:   49 41 35 . 28 . 28 . 39 45 44 . . . . .
status:         enabled
speed:          2931
level:          auto

and :

tfoerste@n22 ~ $ temp
temperatures:   49 42 35 . 28 . 28 . 39 45 44 . . . . .
status:         enabled
speed:          1846
level:          auto

Do I miss omething ?

-- 
MfG/Sincerely
Toralf FÃrster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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