Comment 29 for bug 453444

Same here. Pentium 4 1,5GHz, some old HP motherboard. I'm laic in hardware, but I don't know it has any sensors at all.
The repeated line in var/log/syslog is:
Nov 9 12:19:10 Rencznie-Inkrustowany-Kartofel kernel: [ 2527.403083] CPU0: Temperature above threshold, cpu clock throttled (total events = 880863)
Nov 9 12:19:10 Rencznie-Inkrustowany-Kartofel kernel: [ 2527.404096] CPU0: Temperature/speed normal
The same in kern.log:
Nov 9 12:20:57 Rencznie-Inkrustowany-Kartofel kernel: [ 2634.262246] CPU0: Temperature above threshold, cpu clock throttled (total events = 951122)
Nov 9 12:20:57 Rencznie-Inkrustowany-Kartofel kernel: [ 2634.263447] CPU0: Temperature/speed normal
(500000 in two minutes?)
dd and rsyslogd are using all free CPU, so normal using of PC is almost impossible. Killing, deleting and changing priority don't work for too long. It's more common problem, when I searched help on #ubuntu few people complained about dd and rsyslogd, or about disappearing HDD space, just didn't came to diagnose.