How can I control fans speed on my laptop - Lenovo IdeaPad G555? $ acpi -c shows 3 cooling devices: 1) LCD Brightness 2) Throttling 3) unknown first two controls works: 1st change brightness, 2nd change throttling. last "cooling devices" doesn't work. but.. how can I change fan speed?
(In reply to comment #0) > How can I control fans speed on my laptop - Lenovo IdeaPad G555? This depends on which kind of fan device do you have on this laptop. Fan can be controlled in different ways, e.g. 1. ACPI. (the generic way) 2. platform driver/native driver (need platform specific code) 3. BIOS (transparent to OS) please attach the acpidump output of your laptop so that I can check if there is ACPI fan device or not. Although according to the output of "acpi -c", the answer is probably "no".
As ACPI does not have a feature where a user can control fans speed on their laptop, moving this to platform drivers. (we can observe what the BIOS does for your, but that is about it) It is conceivable that thinkpad-acpi driver may have a native feature here and may run on this box, so moving this bug to the drivers/platform category.