@broesch: i assume that your DSDT or SSDT lists just those two frequencies.
in ubuntu feisty the information for the speed-stepping was included in the
kernel (speedstep-centrino.ko) but now speedstepping is done by the module
acpi-cpufreq and this module does not provide the info for speedstepping (and
it is not the task of the kernel to provide this info - so it is not a kernel
bug but a bug in you bios)
i had the same problem on an fujitsu amilo m1420 with an Pentium M 715
(that's a dothan with 1,5ghz). have a look at you DSDT and SSDT table
and check if you find information for Speedsteping in those tables.
(normaly this info is in an PSS table). if you find just the info for
two speedsteps you have to complete the list. (thats a bit tricky..) and
then you have to boot linux with you modified DSDT. (if the info for
speedsteping is in you SSDT you have to merge your dsdt and ssdt and
tell linux not to load the SSDT from the bios at boot)
i plan to write an howto that describes that a bit more detailed
i will post the link here
cu
CHristoph
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[GUTSY] cpu freq scaling not working anymore
https://bugs.launchpad.net/bugs/132271
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