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List:       lm-sensors
Subject:    Re: [lm-sensors] missing fan RPMS
From:       Guenter Roeck <guenter.roeck () ericsson ! com>
Date:       2012-05-14 13:40:09
Message-ID: 20120514134009.GA15978 () ericsson ! com
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On Sun, May 13, 2012 at 09:58:18PM -0400, James wrote:
[ ... ]
> > > 
> > > > -(
> > > Both fans connected but only one shows up.
> > > 
> > Yes, I think that is exactly the problem. Looks like the board uses a multiplexer
> > to connect multiple fans to the same fan sensor input. Which makes it all but \
> > impossible for third parties (like Linux) to implement working fan control. \
> > Really annoying, especially since the NCT6776F has really a lot of fan sensor \
> > inputs available. 
> > At least some of the other boards from the same vendor have lots of fan \
> > connectors. Did you try all of them ?
> > 
> > Guenter
> > 
> 
> If they are multiplexed, it is weird I didn't at least get 2 numbers when I was \
> moving them around. I tried all the plugs on the motherboard.
> If I get the information from ASRock about how to read the fan speeds, could I make \
> a config file specific to this motherboard? 
I don't think so. We can not manipulate gpio pins from the driver. Even if you manage \
to set the gpio pins from user space, there is no way to synchronize this with the \
kernel driver.

Guenter

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