Hi, I've had this on two completely different machines, an elderly laptop (Toshiba Satellite S2800, Intel 700 MHz CPU, 192 MB RAM, and I currently don't know which graphic card, Ubuntu 5.10) and and elderly common personal computer (AMD 900 MHz CPU, 1 GB RAM, 32 MB NVidia graphic card, Ubuntu 6.06).

Every once a while, the computers would freeze. That is, mouse movement would get impossible, and the keyboard wouldn't work. As I've never heard the harddisk rattle after that point of stop, I guess, it's not the graphics but a more basic system, such as reacting on the CPU heat...

On the laptop, I had this everytime - in contrast to my other PC where this didn't occur for a long time. With this other PC, there appears to be a correlation with the outside temperature to me, which has been rising now as it's getting summer.
I've also removed the CPU, and after that, put it in again. (To be true, I've not been using heat-conductive paste when I put it in, again.)

So I think, this is Ubuntu, reacting on CPU heat.

My question is, how comes, Ubuntu freezes when the CPU gets too warm (or do you have other ideas as for the cause of the freeze?)?
- Firstly, I read, computers would slow down in such cases, but not freeze.
- Secondly, slowing down or even freezing hasn't ever happened to my Windows hardware / software combinations.

Anyone's an idea what's going on?

- As always: Thanks. Your input is much appreciated!

I have been having issues with 6.06--just now starting to search to see if it is a known problem. Sometimes, I find the computer has simply shut down--others I get a "hard freeze"--ie not recoverable with ctrl-alt-del or ctrl-alt-backspace.

Just found this:
https://launchpad.net/distros/ubuntu...ati/+bug/16873

This directly applies to my setup--not sure about yours

Thanks. I really think it's the temperature - as the outside temperature has lowered here in the meantimes, and the PC didn't freeze again since then. When the temperature was high the last days, the computer even froze after some minutes after rebooting (when it had been in use before); otherwise later.

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Sorry for my bad English

Thanks pixellany - This also happens with an NVidia graphics card (not only an ATI one). - So I'm not sure whether it's the graphics system at all.

I'm getting freezes as well with XUbuntu and a Pentium3 850MHz with a GeForce3, I thought it was to do with the i686 kernel at first but re-installed with just the 386 kernel and it still happens.

its locking after about a minute even before I get to login now, can't even install updates in a seperate terminal with /etc/init.d/gdm stopped.