[Gllug] CPU temperature too high

[Tethys]

I've started getting errors appearing:

	Message from syslogd at leto at Mon Jun 12 02:13:21 2006 ...
	leto kernel: CPU1: Temperature above threshold

	Message from syslogd at leto at Mon Jun 12 02:13:21 2006 ...
	leto kernel: CPU0: Temperature above threshold

	Message from syslogd at leto at Mon Jun 12 02:13:21 2006 ...
	leto kernel: CPU0: Running in modulated clock mode

	Message from syslogd at leto at Mon Jun 12 02:13:21 2006 ...
	leto kernel: CPU1: Running in modulated clock mode

Now OK, it's been a bit sunny over the past few days. But this system
has been running fine for a year or so without overheating, so what's
likely to be the cause? The only time I've seen this before has been
when I was running John The Ripper, which was running the CPU flat out
for extended periods of time. However, today I wasn't doing anything
CPU intensive at all (merely editing a file with vim, and listening
to music with xmms).

	leto:~% egrep '(processor|model name|MHz)' /proc/cpuinfo 
	processor       : 0
	model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
	cpu MHz         : 2992.987
	processor       : 1
	model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
	cpu MHz         : 2992.987


	leto:~% sensors
	eeprom-i2c-0-52
	Adapter: SMBus I801 adapter at c800
	Memory type:            DDR SDRAM DIMM
	Memory size (MB):       512

	emc6d102-i2c-0-2e
	Adapter: SMBus I801 adapter at c800
	in0:        +1.43 V  (min =  +0.00 V, max =  +3.32 V)   
	in1:        +1.33 V  (min =  +0.00 V, max =  +2.99 V)   
	in2:        +3.25 V  (min =  +0.00 V, max =  +4.38 V)   
	in3:       +5.00 V  (min =  +0.00 V, max =  +6.64 V)   
	in4:      +11.94 V  (min =  +0.00 V, max = +15.94 V)   
	fan1:      5607 RPM  (min =    0 RPM)                     
	fan2:         0 RPM  (min =    0 RPM)                     
	fan3:         0 RPM  (min =    0 RPM)                     
	fan4:         0 RPM  (min =    0 RPM)                     
	temp1:       +62°C  (low  =  -127°C, high =  +127°C)       
	temp2:       +45°C  (low  =  -127°C, high =  +127°C)      
	temp3:       +48°C  (low  =  -127°C, high =  +127°C)       
	pwm1:      255
	pwm2:      255
	pwm3:      255
	vid:      +1.387 V  (VRM Version 10.0)

What would cause a system to suddenly start overhearing? Both
sensors(1) and a visual check confirm that the CPU and case fans are
apparently working OK. I might suspect a badly seated CPU heatsink,
were it not for the fact that I haven't touched it since building the
system, and haven't had an overheating problem until now.

Any ideas? Where should I be looking?

Tet
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