Public bug reported:
I have a white macbook. It's the first edition with a core duo 2.0Ghz
(32bit) processor. The CPU seems to run at a normal (if a bit hot) 50C
when using it normally at 1GHz (speed scaling) with a very low fan
speed. What's strange is that if I'm not using the computer it climbs
all the way to 77C and yet the fan is running at full speed. As soon as
I move the mouse or write something with the keyboard it goes down fast
to 46C and then back up to the normal 50C. I'm guessing the temperature
is not being correctly reported for some reason. This could be related
to Bug #52852.
A strange thing about this is that the computer wasn't completely idle
during these tests. I had a bittorrent download running in the
background. I guess it could be a problem of the CPU entering those
power saving C states that doesn't happen when there are keyboard/mouse
interrupts.
I measured the temperature using coretemp.c but I was only able to
measure it for the first core because ubuntu's msr module doesn't create
/dev/cpu/1/msr for this dual core machine. This shouldn't make a
difference since the cores are in the same die and should be at the same
temperature.
** Affects: linux-source-2.6.17 (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Computer runs very hot when idle
https://launchpad.net/bugs/73019
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