Unfortunately the problem lies in the ACPI-DSDT: One could put quirks in the
kernel to try and work around the broken DSDT, but an updated DSDT
(http://ginkel2.boerde.de/Lifebook_4220/lt4220.tgz) is probably the correct
approach to fix this one.
** Changed in: linux (Ubuntu)
Status: Triaged => Won't Fix
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acpi-cpufreq doesn't allow >800Mhz on Fujistu T4220
https://bugs.launchpad.net/bugs/177076
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