[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 #27 from Martin Peres <martin.peres at ensi-bourges.fr> ---
(In reply to comment #26)
> (In reply to comment #25)
> 
> > I am the Nouveau developer who added fan management support. I would really
> > advice you follow the hwmon recommendations and name this file pwm1.
> 
> Sorry, I'm novice, didn't know about these. 

Don't feel bad, you cannot know possibly know everything ;)

> Though it's not a hw interface
> really, the exchange is done through io-mapped SMC registers...

Not sure how more hw-oriented the interface could get :D That is still
irrelevant to the discussion though. HWMON is software interface for the
userspace.

> 
> Ok, I'll make necessary changes. I assume it will allow lm-sensors to pick
> it up automatically, is it correct?

Yes, it will!

Just to make sure we understood each others:
- pwm1 (RW) exposes the current pwm value (what you called power)
- pwm1_min(RW) min exposes the mininimum power that should be used by the fan
- pwm1_max(RW) min exposes the maximum power that should be used by the fan
- pwm1_enable (RW) exposes the current fan mode. 0 = DISABLED, 1 = MANUAL (the
user writes the fan power he/she wants to pwm1), 2 = AUTOMATIC (linear fan
management?).

Here is Nouveau's documentation on fan management:
http://cgit.freedesktop.org/nouveau/linux-2.6/tree/Documentation/thermal/nouveau_thermal

I know it is a lot of changes I am asking you to do, but consistency across
drivers is great feature!

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