I decided not to worry about it, and just get used to it.  I _think_ the
old lower temps were more sensible, and I would only worry about my
machine if the "old" temp got really high.

 If anything in the CPU really is as hot as the "new" readings indicate, it 
doesn't seem to be a problem.  And I don't really think anything is that hot.  
I looked at what the authors of the change were saying, and they weren't 
confident that these were accurate or anything, just that they were going to do 
it this way, and might update it if further information on what the numbers 
mean on an absolute scale was forthcoming from Intel.
Probably all these reports coming in from diverse hardware saying that the old 
readings matched the BIOS will encourage them to go back to the old 
calibration.  (I don't believe that the internal temp is actually always 15C 
hotter than the sensor the BIOS uses, since I've checked the BIOS temp right 
after a reboot with a hot CPU, and with an idle CPU.  If the internal temp 
sensor was reading differently, I would expect bigger differences when the CPU 
was hotter.)

 There is no config option to control this.  You'd have to change some
kernel code in coretemp.c and recompile.

-- 
linux 2.6.27-2.3: coretemp reads 15C too hot, and keyboard is occasionally 
unresponsive
https://bugs.launchpad.net/bugs/264290
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