I have a trippy observation which may be a Clue. At least for some
people's problem. I don't know how to use this Clue, but I toss it out
there in case it makes an "aha" for anyone.

I have been having a related problem on my Presario 2100. I recently
wiped WinXP and replaced with Feisty. For about a week everything was
awesome and I was really loving it. Then mysteriously this problem just
started happening - I couldn't do anything remotely computationally
intensive (like open firefox) without the computer shutting down and
getting these cpu scaling and critical temperature complaints from the
kernel. So at first I thought I had the Ubuntu analog of a virus - it
must be something I downloaded. Tried removing a bunch of stuff and nope
problem still there. So I decided to re-install Feisty. And
interestingly *it would not work from the Live CD either* - where before
it was *perfect* for hours at a time. The reinstall always causes one fo
thhese critical temperature failres and never completes.

So here's the trippy observation. Fact one, when I was doing all this
fiddling with Ubuntu, I was unplugging and plugging the laptop a lot as
I was moving it from where I normally keep it to next to the router
because I need an internet connection to install ndiswrapper to make my
wireless card work - so my battery was always draining a bit. Fact two,
I have a crappy battery, and just for fun I configured Gnome to always
show the battery monitor. All the times I was using Ubuntu I always saw
the icon in the shape of a battery and I always assumed that this was
just how it looked. Then one day - just before my problems started - I
notice it in the shape of a power cord and it says I am running on AC
power. This is odd thinks I, because I was not used to seeing this, but
since my battery is crap it makes sense that it would be charging
practically forever if you let it drain even a little bit.

So after doing a lot of reading, two and two come together of a
seemingly improbable possibility and I try unplugging the power,
starting Ubuntu, letting it drain a litte, and starting my install.
Suddenly, miraculum est, I have the persistent battery icon and my
install is going without a hitch. Hmmm.

As odd as it seems, could the problem be related in some cases and in
some possibly indirect way to something that should be a total one-off -
the battery charging? As long as my battery is not fully charged I seem
to be rolling in puppies over here, but they turn to rottweilers when
the battery gets a full charge.

BTW - I am sure I should clean out my fan and I will take this as a
wake-up call to do so. But my fan/temperature to my qualitative
perception seems no different than on WinXP when Ubuntu is actually
working for me. It was working fine under Windows (well, not "fine", but
not doing anything like this). Something else is going on here.

-- 
CPU overheats during high usage "throttling <not supported>"
https://bugs.launchpad.net/bugs/22336
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