The latest BIOS update (3.09) mentions, among other things:
- Fixed ALS sensor communication failures (What’s an ALS sensor? Is it involved in fan control?)
- Fix ACPI thermal_zone3 reporting incorrect values occasionally.
Is this supposed to fix these fan speed issues? Or is it completely unrelated?
Update: After an hour or so with the new BIOS, I don’t think this has improved. At first I wasn’t sure but now the fan speed jumps are back (even though the temperatures aren’t that high and the machine isn’t doing much, just surfing the web)