[lm-sensors] Not detecting all fan RPMs
khali at linux-fr.org
Mon Mar 26 22:28:43 CEST 2012
On Mon, 26 Mar 2012 13:16:35 -0700, Guenter Roeck wrote:
> On Mon, 2012-03-26 at 15:44 -0400, Jean Delvare wrote:
> > The NCT6775 supports only 4 fans, so either there is some multiplexing
> > in place (which we don't support) or you have a second hardware
> > monitoring chip on your system.
> I had not thought about multiplexing - good point. That would explain
> why the chassis fans can only be configured for manual mode or full on.
From a monitoring perspective, this makes absolutely no sense of
course, as this means a delay in detecting fan failure. But the fact is
that we've already seen this in the past. Manufacturer apparently
preferred to save a few cents per board by using multiplexing and
getting an ugly and unreliable solution rather than adding a second
hardware monitoring chip for a clean and reliable one. Tsss...
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