[Bug 73338] Fan speed in idle at 40% with radeonsi and at 18% with catalyst

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73338

--- Comment #66 from Martin Peres <martin.peres at ensi-bourges.fr> ---
(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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