Re: PWM fan speed too high

[Klaus-Peter Schrage <kpschrage@xxxxxx>]

Am 24.07.2014 16:35, schrieb poma:
> > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/gpu/drm/nouveau/core/subdev/therm/fan.c?h=linux-3.14.y#n195
> >
> > static void
> > nouveau_therm_fan_set_defaults(struct nouveau_therm *therm)
> > {
> >     struct nouveau_therm_priv *priv = (void *)therm;
> >
> >     priv->fan->bios.pwm_freq = 0;
> >     priv->fan->bios.min_duty = 0;
> >     priv->fan->bios.max_duty = 100;
> >     priv->fan->bios.bump_period = 500;
> >     priv->fan->bios.slow_down_period = 2000;
> > /*XXX: talk to mupuf */
> > #if 0
> >     priv->fan->bios.linear_min_temp = 40;
> >     priv->fan->bios.linear_max_temp = 85;
> > #endif
> > }
> >
> > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/gpu/drm/nouveau/core/subdev/therm/fan.c?h=linux-3.15.y#n195
> >
> > static void
> > nouveau_therm_fan_set_defaults(struct nouveau_therm *therm)
> > {
> >     struct nouveau_therm_priv *priv = (void *)therm;
> >
> >     priv->fan->bios.pwm_freq = 0;
> >     priv->fan->bios.min_duty = 0;
> >     priv->fan->bios.max_duty = 100;
> >     priv->fan->bios.bump_period = 500;
> >     priv->fan->bios.slow_down_period = 2000;
> >     priv->fan->bios.linear_min_temp = 40;
> >     priv->fan->bios.linear_max_temp = 85;
> > }
> >
> > "drm/nouveau/therm: let the vbios decide on the automatic fan
> > management mode"
> > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/gpu/drm/nouveau/core/subdev/therm/fan.c?h=linux-3.15.y&id=0e994d6
> >
> >     This should fix automatic fan management on fermi cards who do not
> > have 0x46 entries in the thermal table.
> >     On my nve6, the blob sets the default linear range from 40°C to
> > 100°C but my nvcf's default values are 40°C to 85°C.
> >     Let's keep 85 as a default for everyone.
> >
> > Here refers to NVCF, your is NV108 (GK208) i.e. GeForce GT 630
> > http://nouveau.freedesktop.org/wiki/CodeNames/
> >
> > The fan is really LOUD all the time. How do I make it more quiet?
> > http://nouveau.freedesktop.org/wiki/FAQ/#index25h3
> > ... In the mean time, if you are interested, you can read
> > PowerManagement and/or contact mupuf on the #nouveau freenode IRC
> > channel.
>
> Fan at full speed on Dell T1650
> https://bugzilla.redhat.com/show_bug.cgi?id=1121331
>
> [NVCF] PWM fan speed too high
> https://bugs.freedesktop.org/show_bug.cgi?id=80901
>
> [Nouveau] hwmon: question about the sysfs interface
> http://lists.freedesktop.org/archives/nouveau/2014-July/018012.html
>
>
> nouveau funky fan club

Thank you, Mr. Fantomas, for your thorough analysis, which gave some 
insight even to me! But I can refrain from trying a kernel recompile 
which I last did a decade or so ago (although, as far as I can remember, 
this is not such a kind of rocket science as one might guess from the 
recent thread on "new kernel & rebooting").

So I'll wait until a clever patch finds its way into the 
(Fedora-)kernel. Meanwhile I stick to the 3.14-kernel.


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