I believe this is an issue about your hardware. Therefore try to find if the fan is not working very well, or too much dust...
A normal hardware should work for the disk I/O, and image compression when Clonezilla is running.
I have no thermal problems with my hardware running Windows XP since years, and even when running ntfsclone | bzip2 from SystemRescueCD.
Do you have multi-core CPU there? If so, Clonezilla will use all the cores by default.
"ntfsclone | bzip2" does not use multicore CPU.
Maybe this is the reason?
No, I have single core 2 Ghz Intel Centrino CPU on IBM ThinkPad R52.
I have experienced exactly the same symptoms on a Lenovo T60. When running clonezilla, debian complains about "acpi (...) Thermal Emergency (...) Something extremely hot".
I'm running Windows XP on the same machine almost round the clock for 2.5 years without any Windows complaint or hardware malfunction.
It does look like Clonezilla doesn't throttle the CPU.
Which version of Clonezilla live did you use? Did you try the latest testing, i.e. 1.2.8-20 or 20110323-maverick?
Hi Steven, thanks for your reply.
I'm using clonezilla-live-1.2.6-59-i686.
I haven't used the test version(S) you mention. WIll try again next week when I make the next image backup and will report.
Hi again. A short update. I´m doing an image backup with clonezilla-live-20110328-maverick.iso and the Lenovo T60 is still reporting
"d_acpi: THERMAL EMERGENCY: a sensor reports something is extremely hot!"
The underside of the laptop feels warm but I´d say it is not as hot as in the previous backups reported earlier.
Clonezilla doesn´t report temperatures as in the previous case but I see in /var/log/kern.log temperatures (Celsius) of 87, 37, 39...
Backing up to a USB hard-disk. Started at 1.5GB/min, and slowed down to around 1GB/min and then to 960MB/second
Thanks for the update.
How about Clonezilla live 1.2.8-26?
It's using a newer linux kernel 2.6.38-3. Maybe it will work better.