Kernel_task eating CPU with MotorolaSM56 modem

Dear Apple Discussions,
I recently got a fifth generation (1.67GHz) 15'' Aluminum PowerBook.
Whenever I connect to the internet via dial-up my kernel_task goes up to 30%CPU usage (just connected, not doing anything). This does not occur if I connect to the internet via ethernet (AirPort has not been tested thus far).
This does not occur with my first generation (1.25GHZ) 15'' Aluminum PowerBook (just has been downgraded to 10.3.9).
When comparing the two laptop's I noticed that the "older" model has a InternalUSBModem.kext (v2.6.3) driver for the modem, while my newer PB has a MotorolaSM56K.kext (v1.3.3) driver.
The kicker comes with my first generation (1.8GHz) iMac G5. It also has a MotorolaSM56K.kext (v1.3.1) driver for the modem and it too has a kernel task which eats up 40% of the CPU when connected to the internet (just connected, not doing anything).
I have read on the news groups about the kernel task - but to no real avail.
I have turned off IPv6 to no effect.
Any suggestions?
Thanks,
AppleMonkey
v.5 PowerBook G4 15'' Mac OS X (10.4.3) 2GB RAM

Thanks for the response, at least that makes more sense now.
A little irritating that 30% of my processor is used by the modem, hopefully they won't do that with the ethernet as well.
Applemonkey

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