Recently the fan for my Asus EeePC 1005HA decided to go beserk and make lots and lots of noise. After trying a few tricks on the web and being unable to disconnect the fan manually I found this hack which you can use to disable the fan in Ubuntu/Linux.
# echo 1 > /sys/devices/platform/eeepc/hwmon/hwmon1/pwm1_enable # echo 0 > /sys/devices/platform/eeepc/hwmon/hwmon1/pwm1
You need to run these commands as root. Add them to /etc/rc.local if you want to turn the fan off on each boot. To get your fan back, do something like this:
# echo 70 > /sys/devices/platform/eeepc/hwmon/hwmon1/pwm1
So far everything seems fine without my fan but I'll let you know if my computer melts.