Someone posted the following on the T4220 wiki page (
https://help.ubuntu.com/community/T4220 ):
"Actually the problem lies in the ACPI-DSDT. The Linux-Kernel reports to
be WIN-Vista-compatible, therefore the DSDT tries to load an additional
piece of AML code in this case, which is not ACPI-compatible. After this
bug there is a missing temperature offset, an the kernel starts to
thermo-throttle CPU. The incomplete load of the vista table is also the
reason for the missing symbols in the button-events.
2 Solutions are possible:
switch off Vista compatibility in ACPI (acpi_osi="!Windows 2006")
use modified DSDT:
http://ginkel2.boerde.de/Lifebook_4220/lt4220.tgz "
I've tested the acpi_osi= kernel option and it appear to solve my cpu
scaling issues, so this bug can probably be marked closed.
--
acpi-cpufreq doesn't allow >800Mhz on Fujistu T4220
https://bugs.launchpad.net/bugs/177076
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