The regular expression in the sensors plugin expects two RPM values, current and minimum (see http://munin-monitoring.org/browser/trunk/plugins/node.d.linux/sensors_.in?rev=4128#L93 for the regular expression).
I am having two setups where only the current value gets shown:
thinkpad-isa-0000
Adapter: ISA adapter
fan1: 3273 RPM
f71882fg-isa-0a00
Adapter: ISA adapter
+3.3V: +3.41 V
in1: +1.05 V (max = +2.04 V)
in2: +0.18 V
in3: +0.08 V
in4: +0.94 V
in5: +1.12 V
in6: +0.19 V
3VSB: +3.31 V
Vbat: +3.26 V
fan1: 986 RPM
fan2: 0 RPM ALARM
fan3: 2290 RPM
fan4: 0 RPM ALARM
temp1: +41.0°C (high = +255.0°C, hyst = +251.0°C)
(crit = +255.0°C, hyst = +251.0°C) sensor = Intel PECI
temp2: +75.0°C (high = +255.0°C, hyst = +251.0°C)
(crit = +255.0°C, hyst = +251.0°C) sensor = transistor
temp3: +39.0°C (high = +255.0°C, hyst = +253.0°C)
(crit = +255.0°C, hyst = +253.0°C) sensor = transistor
Munin should consider the minimum to be optional.
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