Public bug reported:

I'm on a Thinkpad Laptop 600X running Xubuntu Feisty kernel
2.6.20-15-generic.  My clock is running 2.5X too fast (have talked to
others that have clocks running an order of magnitude too slow as well).

Using /proc/interrupts, I have discovered that the timer does 250 ticks
per REAL second, but my system progresses by a second every 100 ticks.

When booting into any of my older kernel versions, the problem
disappears.

I Tried each of the following boot options:
noapic
nolapic
noapictimer
acpi=off
acpi=noirq
clock=pmtmr
clock=PIT
None of which worked.

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

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clock goes 2.5 times too fast
https://bugs.launchpad.net/bugs/109633
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