[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 #43 from Chernovsky Oleg <adonai at xaker.ru> ---
(In reply to comment #42)
>If I got it right, you're giving an option to manually set fan-speed.

Yes, you understood it right. For now it's only the option to manually set fan
speed.

> 
> Wouldn't it be possible to implement such behaviour in the drm drivers? I
> mean like: reading fan profile (like 40°C -> 20%, 60°C -> 25%, 80°C -> 45%
> etc. and assuming linear scaling between those values), reading temperatures
> and setting fan-speed accordingly?
> 

That's not impossible, and there's an API called Overdrive6 that's both
accessible to Windows and Linux (only closed source driver though). Mmiotracing
those calls (yeah, actually that thing you mentioned - setting
temperature<-->speed pairs) can lead to implementing this behaviour in
open-sorce driver. Alex said he can provide some patches for me to start with,
let's see if it will cover these demands.

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