est: CPU supports Enhanced Speedstep, but is not recognized.

[Kris Kennaway]

For the past few months some of my machines have reported at boot:

cpu0: <ACPI CPU> on acpi0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 722072206000722
device_attach: est0 attach returned 6
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 722072206000722
device_attach: est1 attach returned 6
p4tcc1: <CPU Frequency Thermal Control> on cpu1
...
(for every CPU).

They were not previously this verbose.  What is going wrong?

Kris