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Old 01-27-2006, 04:11 AM   #1
Registered: May 2004
Posts: 31

Rep: Reputation: 15
CPU0: Running in modulated clock mode

Dear all,

I have a question regarding some possible overheating problem.
Each time I run a CPU-intensive program, my console gets litteraly flooded with such error messages from the kernel (2.6.8):

kernel: CPU0: Running in modulated clock mode
kernel: CPU0: Temperature above threshold

My CPU is a Intel Pentium 4 CPU 3.20GHz. It's got all its fans replaced (it's the computer at my work) and still the problem remains.

To be able to keep working, I turned the emergency messages out. But it's far from ideal(!) and should only be temporary (until I find a solution to that problem...).

I installed lm_sensors and from what I get back, it seems to me that the CPU temperature is in the normal range. This is the output I get from sensors:

Adapter: ISA adapter
VCore: +1.32 V (min = +1.30 V, max = +1.44 V)
+12V: +11.73 V (min = +10.82 V, max = +13.19 V)
+3.3V: +3.33 V (min = +3.14 V, max = +3.47 V)
+5V: +5.17 V (min = +4.75 V, max = +5.25 V)
-12V: -14.91 V (min = -10.80 V, max = -13.18 V)
V5SB: +5.03 V (min = +4.76 V, max = +5.24 V)
VBat: +0.00 V (min = +2.40 V, max = +3.60 V)
fan1: 0 RPM (min = 3026 RPM, div = 2)
CPU Fan: 2824 RPM (min = -1 RPM, div = 2)
fan3: 0 RPM (min = 100 RPM, div = 128)
M/B Temp: +49C (high = -12C, hyst = +86C) sensor = thermistor ALARM
CPU Temp: +67.0C (high = +80C, hyst = +75C) sensor = thermistor
temp3: -48.0C (high = +80C, hyst = +75C) sensor = thermistor
vid: +1.375 V
Sound alarm enabled

Adapter: SMBus I801 adapter at 0400
Memory type: DDR SDRAM DIMM
Memory size (MB): 512

Adapter: SMBus I801 adapter at 0400
Memory type: DDR SDRAM DIMM
Memory size (MB): 512

Here is the top-4 of the programs running on my computer at the moment:
87.5 4.1 3520:42 java
10.1 9.8 1647:04 X
1.0 0.3 86:55.24 enlightenment
0.7 0.4 0:02.07 Eterm

The CPU-intensive program is in Java and is first.

Since IMHO the temperature of the CPU seems to be in quite the normal range, I started to wonder about the temperature thresholds that are used. Are they a little bit too low? Is this coming from the kernel? Can I do something about it?

I'd really like to find a solution and to use my computer at full speed. Any idea???
Old 01-28-2006, 03:02 PM   #2
Senior Member
Registered: Jun 2004
Posts: 2,553

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i guess the first thing is to figure out if temperature is actually to high or if it's just getting confused over bad information or inapropriate threasholds
you can run the command
"sensors" i think to see if some of the output looks bogus
i don't use that functionality but i think look at /etc/sensors.conf
and check what are the threasholds

i think sensord writes some junk in the /proc filesystem and monitors like GKrellM also should to be able to tell you what the readings are
Old 01-28-2006, 03:24 PM   #3
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Registered: Jun 2004
Location: Australia
Distribution: Mandriva/Slack - KDE
Posts: 1,672

Rep: Reputation: 46
I never trust any sensors. They often show incorrect readings. Put your finger on the heatsink and see if it really is too hot. Is it a self built machine? Does it have heatsink compound correctly applied to CPU?

I've avoided the p4's lately due to het issues, but a lot of people run them fine...


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