I am also having this problem in Gutsy (also in Feisty) so the problem
has not gone away. I was having overheating problems and had to turn off
the acpi (and apm) service in the "services" administration menu for the
fan to come back on. Otherwise it comes on when you first switch on, but
turns off immediately after the linux kernel boots.
Some diagnostics are below. I don't think this is a hardware problem
since the sensors app gets the CPU temp correct (see below).
My machine is an E-machines T1742 destop. Celeron 1.7GHz.
Diagnostics:
abacus:~$ acpi -V
Thermal 1: passive , 4294967040.0 degrees C
No support for device type: ac_adapter
abacus:~$ cat /proc/acpi/thermal_zone/THRM/*
<setting not supported>
<polling disabled>
state: passive
temperature: -269 C
critical (S5): -264 C
passive: -273 C: tc1=0 tc2=0 tsp=600 devices=CPU0
active[0]: -267 C: devices=FAN1
sensors
smsc47m192-i2c-4-2d
Adapter: SMBus I801 adapter at 1880
+2.5V: +0.00 V (min = +3.32 V, max = +2.90 V) ALARM
VCore: +0.00 V (min = +2.99 V, max = +2.99 V) ALARM
+3.3V: +0.00 V (min = +4.38 V, max = +4.38 V) ALARM
+5V: +0.00 V (min = +6.43 V, max = +6.64 V) ALARM
+12V: +3.12 V (min = +6.94 V, max = +15.88 V) ALARM
VCC: +3.37 V (min = +4.38 V, max = +2.18 V) ALARM
+1.5V: +0.04 V (min = +1.87 V, max = +1.99 V) ALARM
+1.8V: +0.00 V (min = +2.39 V, max = +2.39 V) ALARM
Chip Temp: +44.0°C (low = +127°C, high = -1°C) ALARM
CPU Temp: +39.0°C (low = -1°C, high = -1°C)
Sys Temp: -128.0°C (low = -1°C, high = -1°C) FAULT
vid: +1.475 V (VRM Version 9.0)
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CPU fans won't start
https://bugs.launchpad.net/bugs/70739
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