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[ 42.171867] p4-clockmod: Warning: EST-capable CPU detected. The acpi-cpufreq module offers voltage scaling in addition to frequency scaling. You should use that instead of p4-clockmod, if possible.
[ 42.177122] p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available
[ 42.532274] ondemand governor failed, too long transition latency of HW, fallback to performance governor
Renaming p4-clockmod.ko works around it so then acpi-cpufreq handles it as expected.
However this only happens with the kernel from this repository. The official 3.0.0-12.20 in Ubuntu (and newer vanilla kernels) don't show this behaviour.
Does this also happen on other netbooks? And maybe someone finds a solution? ;-)