Re: [PATCH v4] thinkpad_acpi: Add support for dual fan control on select models

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pon., 27 kwi 2020 o 20:41 Dario Messina <nanodario@xxxxxxxxx> napisał(a):
>
> On Thu, Apr 23, 2020 at 23:57:59 CEST, Lars <larsh@xxxxxxxxxx> wrote:
> > This adds dual fan control for the following models:
> > P50, P51, P52, P70, P71, P72, P1 gen1, X1E gen1, P2 gen2, and X1E gen2.
> >
> > Both fans are controlled together as if they were a single fan.
> > [...]
> > Background:
> > I tested the BIOS default behavior on my X1E gen2 and both fans are always
> > changed together. So rather than adding controls for each fan, this controls
> > both fans together as the BIOS would do.
> Hi Lars, why have you chosen to control multiple fans in this way?
> I know that BIOS controls both fans together, but the EC has the capabilities
> to control both fans independently, so maybe it can be convenient to expose
> this feature.

+1
Previous version of the patch [1] allows to control both fans independently.
However some software like thinkfan is not ready to control two fans.
But I also think this feature should be at least optionally exposed.

[1] https://github.com/civic9/thinkpad_acpi.2ndfan.patch/blob/master/thinkpad_acpi.2ndfan.patch/thinkpad_acpi.2ndfan.patch


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