[gentoo-user] Sudden case fan problems by switching to new kernel...

[gentoo-user] Sudden case fan problems by switching to new kernel...

[tuxic]

Hi,

The configuration for kernel 5.6.3. (vanilla) works fine.for me.
Then I changed to kernel 5.6.4 using the same configuration.

Suddenlu the fan at the back of my PC case never stops from
rotating at its highest speed.
Changing back to kernel 5.6.3. and the problem is gone.

On the internet I found one report of a fan problem after
an upgrade of Ubuntu...but that was 5 years ago...

I compared the entries in /sys/devices/platform/nct6775.2592/hwmon/hwmon1/*
between the two kernels but found nothing obvious.

The CPU temperature was around 45° C in both cases.

Waiting does not help also...
(in case kinda 'settling time' has changed...or so...)

Is there any other place to investigate?
What could be the root of this?

Cheers!
Meino

[gentoo-user] Re: Sudden case fan problems by switching to new kernel...

[Ian Zimmerman]

On 2020-04-15 07:29, tuxic@posteo.de wrote:

> The configuration for kernel 5.6.3. (vanilla) works fine.for me.  Then
> I changed to kernel 5.6.4 using the same configuration.
> 
> Suddenlu the fan at the back of my PC case never stops from rotating
> at its highest speed.  Changing back to kernel 5.6.3. and the problem
> is gone.

Something similar happened to me too with a recent kernel upgrade but in
the 5.4's.

The reason was that my kernel config changed to build the default CPU
powersave driver as a module, and apparently that is a poor idea, it
needs to be built in.  When I rebuilt the kernel with the driver built
in, the fan went back to normal.

In your case: are both scenarios on the same hardware, since as we all
know you're just switching?

-- 
Ian

Re: [gentoo-user] Re: Sudden case fan problems by switching to new kernel...

[tuxic]

On 04/15 05:13, Ian Zimmerman wrote:
> On 2020-04-15 07:29, tuxic@posteo.de wrote:
> 
> > The configuration for kernel 5.6.3. (vanilla) works fine.for me.  Then
> > I changed to kernel 5.6.4 using the same configuration.
> > 
> > Suddenlu the fan at the back of my PC case never stops from rotating
> > at its highest speed.  Changing back to kernel 5.6.3. and the problem
> > is gone.
> 
> Something similar happened to me too with a recent kernel upgrade but in
> the 5.4's.
> 
> The reason was that my kernel config changed to build the default CPU
> powersave driver as a module, and apparently that is a poor idea, it
> needs to be built in.  When I rebuilt the kernel with the driver built
> in, the fan went back to normal.
> 
> In your case: are both scenarios on the same hardware, since as we all
> know you're just switching?
> 
> -- 
> Ian
> 
Hi Ian,

I only switched the kernel. Anything else remains the same. I will
check for the "modules effect" you described and I am prettu sure,
that this will in my case, also!

I will report later, if a will have some results...

Cheers!
Meino