same problem on my thinkpad x200s
speed shows 0
universknight@laptop2:~$ cat /proc/acpi/ibm/fan
commands: level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands: enable, disable
commands: watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
fan goes full speed no matter what level i set.
it will turn off when level set to 0
it can fix by restart, the speed will shows correctly but will goes full speed for a random time. and the speed will shows 0 again.