hmerzic@home:~$ uname -a
Linux home 4.10.0-32-generic #36~16.04.1-Ubuntu SMP Wed Aug 9 09:19:02 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

hmerzic@home:~$ cat /proc/acpi/ibm/fan
status:     enabled
speed:      4638
level:      auto

hmerzic@home:~$ cat /proc/acpi/ibm/fan
status:     enabled
speed:      0
level:      auto