Core i7 not scaling frequency down

Hi,

I just got a Nehalem CPU and it works OK except that the fans are always
running full power and it produces heat like an oven.

  $ cat /proc/acpi/processor/P001/info
  processor id:            0
  acpi id:                 1
  bus mastering control:   yes
  power management:        yes
  throttling control:      no
  limit interface:         no
  $

Oh, no throttling and no limit support?  How can this be?  I'm using
2.6.30 but this appears to be bogus; Windows scales down the CPU
frequency OK.

Does this mean my BIOS ACPI tables are bogus?

I get this message at boot time, but it appears to be unrelated:

  ACPI Warning (tbutils-0246): Incorrect checksum in table [OEMB] - 00, should be FE [20090320]

Any ideas what I could do now to get the CPU to slow down?

Thanks,

Felix