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Re: How To Find Out Fan Speed Via Software



John Summerfield wrote:
Robert L Cochran wrote:
Is there a way to find out the cpu fan speed through software -- a shell script or other utility maybe? I'd like some way to monitor cpu fan speed and get a notification if the fan quits unexpectedly.

You need lm-sensors


run sensors-detect as root, agree with everything. Then,
[root mail httpd]# LANG=C sensors
eeprom-i2c-0-51
Adapter: SMBus I801 adapter at e000
Memory type:            DDR SDRAM DIMM
Memory size (MB):       256

eeprom-i2c-0-50
Adapter: SMBus I801 adapter at e000
Memory type:            DDR SDRAM DIMM
Memory size (MB):       256

adm1025-i2c-0-2d
Adapter: SMBus I801 adapter at e000
+2.5V:     +1.48 V  (min =  +0.00 V, max =  +3.32 V)
VCore:     +1.48 V  (min =  +0.00 V, max =  +2.99 V)
+3.3V:     +3.30 V  (min =  +0.00 V, max =  +4.38 V)
+5V:       +5.08 V  (min =  +0.00 V, max =  +6.64 V)
+12V:      +0.00 V  (min =  +0.00 V, max = +15.94 V)   ALARM
VCC:       +3.27 V  (min =  +0.00 V, max =  +4.38 V)
CPU Temp:  +38.0 C  (low  =    +0 C, high =  +127 C)
M/B Temp:  +34.0 C  (low  =    +0 C, high =  +127 C)

[root mail httpd]#

I have seen fan speed mentioned.


Word of warning.

What I did find out about sensors is the accuracy of the voltages can be wrong. Take note that this could give a false sense of security. I had a PSU failing but sensors didn't read the voltage correctly. I lost a DVD burner and almost lost a hard drive due to this. You can play with the settings and calibrate the settings.

I confirmed my settings with a good digital volt meter.

I was reminded of this when I saw the ALARM in the above link.
--
Robin Laing


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