As others have noted, the workaround is to set the fan to disengaged
mode so that it runs at full speed.  As for it previously being worse;
in some cases it sounds like there may have been less dust in the fan at
an earlier time, and in others, various changes over time may have
caused the cpu to work harder and generate more heat.  The bios is
supposed to respond to more heat by ramping up the fan speed, but
reports indicate this is broken and the bios won't go over 4000 rpm
unless you override it with the disengaged state.

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https://bugs.launchpad.net/bugs/751689

Title:
  [Lenovo Thinkpad x201s] Overheat due to slow fans when on 'auto'

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