I think I just managed to trigger this without suspending etc.

I cold-booting, had the full spectrum of frequencies, decided to run the
tpfancontrol script (which overrides the inbuilt fan control logic) and
the cpufreq spectrum got locked between 1Ghz and 1Ghz:

  current policy: frequency should be within 1000 MHz and 1000 MHz.


Running cpufreq-set doesn't change anything.

-- 
cpufreq locked in slowest speed
https://bugs.launchpad.net/bugs/88899
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