[Nouveau] [Bug 80901] [NVCF] PWM fan speed too high under kernel 3.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80901

--- Comment #11 from Martin Peres <martin.peres at ensi-bourges.fr> ---
Thanks for all this information. It seems like NVIDIA changed the default
minimum temperature before increasing the fan speed
(http://code.woboq.org/linux/linux/drivers/gpu/drm/nouveau/core/subdev/therm/fan.c.html#195).

Based on your information, I would guess it is set to 60°C instead of the 40°C
I saw on some card. It is very possible that they set a different value per
chipset.

I'll check again with a recent version of the blob what is the default
temperature at which the fan speed starts being increased but I don't think the
fix should be to bump the value (that I will set to the minimum value I found
across the boards). The proper fix would be to let users change this value in
sysfs.

I'll keep the bug open as a reminder but my time is very limited this summer.
If you feel like writing the patch (in nouveau_hwmon.c), I would gladly review
it!

Thanks for reporting :)

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