Additional info to above:

If I add acpi=off to grub, I get the full 2.13 ghz. I then tried
immediately rebooting into windows and re-ran perfmon, but windows was
still limited to 1.467 ghz as per above. Perhaps ACPI is broken on this
laptop? Also, I tried booting into the live 6.06 CD to see if it was a
kernel issue (since it used to run at 2.13 ghz under dapper), but it was
still limited to 1.467. This really makes me wonder if Feisty hasn't
done something bad to the ACPI in the bios, but I can't imagine it
WRITES to the bios. I hope not. Thanks!

-- 
cpuinfo_max_freq is (really) wrong
https://bugs.launchpad.net/bugs/91553
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