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CPU fan not working after suspend to RAM

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linux-howto

http://forums.fedoraforum.org – Hello everyone, I'm a new Fedora user, I'm running F12 x86_64 on a Dell Studio 17 (1737) laptop and everything is fine for me with this distro except for one or two issues. When I use the suspend to RAM functionality (Acpi state S3) everything works fine but when the computer resumes from suspend state the CPU fan is not working any more and the output of acpitool is: Battery #1 : charged, 100.0%, 00:00:00 AC adapter : on-line Thermal zone 1 : ok, 0 C Thermal zone 2 : ok, 0 C Thermal zone 3 : ok, 0 C all the thermal zones temperatures seem to be zero decimal degrees!!! Without the fan running the temperature grows and when it becomes critical (after a couple of hours, depending on CPU usage intensity) the computer turns off suddenly losing all unsaved data. If I suspend to disk (hibernate, Acpi state S4) there is no problem, the fan starts normally on resume and the acpitool output is: Battery #1 : charged, 100.0%, 00:00:00 AC adapter : on-line Thermal zone 1 : ok, 51 C Thermal zone 2 : ok, 49 C Thermal zone 3 : ok, 55 C with reasonable temperature values. The output of acpitool --fan is: Fan : <not available> I have no idea on how how to carry out further debug on this problem in order to fix it. Many thanks for any suggestion. (HowTos)