Comment # 66
on bug 73338
from Martin Peres
(In reply to Alex Deucher from comment #64) > > As far as percent vs. rpm, I'm not sure which would be preferred. I think > the hwmon subsystem generally prefers rpm. Maybe add callbacks for both > percent and rpm and then check rdev->pm.fan_pulses_per_revolution. If it's > 0, expose it as a percent. if not, expose as rpm. Thoughts? Might be > worth asking on the hwmon mailing lists. No need to guess, everything is written here ;) https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface pwm1 should expose the duty cycle and nothing else. If you also have a tachometer, expose it with fan1_input :) If you want to set the fan speed with RPM instead of the duty cycle, you'll need to use fan1_target. You may wonder what should happen if you set both pwm1 and fan1_target. Well, I would think that the latest you set should take precedence. Please try to stick to the document I provided, for the sake of having a common behaviour. I hope I helped a little on this ;)
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