Measured Fan RPM Jumps Frequently to 675000 RPM

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Dear @ll,

I am monitoring multiple systems (with Asus M5A78LE mainboards) using sensors and Munin.

On one node I often get a value of 675000 RPM for the FAN2 speed.
Usually, the value of FAN2 is approx 1950 RPM.

The jump can frequently be seen if sensors is executed manually in a fast sequence:


host:~ # sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +0.0°C  (high = +70.0°C, crit = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:       +1.42 V  (min =  +0.85 V, max =  +1.70 V)
 +3.3 Voltage:       +3.40 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:         +5.08 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:       +12.40 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:      3813 RPM  (min =  600 RPM)
CHASSIS FAN Speed:  1406 RPM  (min =  600 RPM)
CHASSIS FAN 2 Speed:675000 RPM  (min =  600 RPM)
CPU Temperature:     +43.0°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:      +38.0°C  (high = +45.0°C, crit = +75.0°C)

host:~ # sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +0.0°C  (high = +70.0°C, crit = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:       +1.42 V  (min =  +0.85 V, max =  +1.70 V)
 +3.3 Voltage:       +3.40 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:         +5.08 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:       +12.40 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:      3813 RPM  (min =  600 RPM)
CHASSIS FAN Speed:  1406 RPM  (min =  600 RPM)
CHASSIS FAN 2 Speed:675000 RPM  (min =  600 RPM)
CPU Temperature:     +43.0°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:      +38.0°C  (high = +45.0°C, crit = +75.0°C)

host:~ # sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +0.0°C  (high = +70.0°C, crit = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:       +1.42 V  (min =  +0.85 V, max =  +1.70 V)
 +3.3 Voltage:       +3.40 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:         +5.08 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:       +12.42 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:      3813 RPM  (min =  600 RPM)
CHASSIS FAN Speed:  1409 RPM  (min =  600 RPM)
CHASSIS FAN 2 Speed:1950 RPM  (min =  600 RPM)
CPU Temperature:     +43.0°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:      +38.0°C  (high = +45.0°C, crit = +75.0°C)

host:~ # sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +0.0°C  (high = +70.0°C, crit = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:       +1.42 V  (min =  +0.85 V, max =  +1.70 V)
 +3.3 Voltage:       +3.40 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:         +5.08 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:       +12.42 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:      3813 RPM  (min =  600 RPM)
CHASSIS FAN Speed:  1409 RPM  (min =  600 RPM)
CHASSIS FAN 2 Speed:1950 RPM  (min =  600 RPM)
CPU Temperature:     +43.0°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:      +38.0°C  (high = +45.0°C, crit = +75.0°C)

host:~ # sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +0.0°C  (high = +70.0°C, crit = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:       +1.42 V  (min =  +0.85 V, max =  +1.70 V)
 +3.3 Voltage:       +3.40 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:         +5.08 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:       +12.42 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:      3813 RPM  (min =  600 RPM)
CHASSIS FAN Speed:  1409 RPM  (min =  600 RPM)
CHASSIS FAN 2 Speed:1950 RPM  (min =  600 RPM)
CPU Temperature:     +43.0°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:      +38.0°C  (high = +45.0°C, crit = +75.0°C)


This just happens on one node. On the other nodes the measured values seem to be stable.

Thanks for your help.

Regards
Sascha Haupt




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