On 02/22/2011 01:31 PM, Ian Dobson wrote:
You can add a tested by ian dobson (i.dobson@xxxxxxxxxxxxxx) for a nct6776f on a Asus p8p67 pro
Same board here. Driver seems to work well, though I'm still trying to figure out why pwm1 seems to affect 2 of the 3 case fans I have in addition to the cpu fan. If I set pwm1 to zero, fan1 stops as expected, but so does does fan3 according to the inputs. I visually can see though, that front and rear fans have stopped, but the top fan is still going. All of the case fans are 3 pin. Fans 2 and 3 still show movement according to the inputs when pwm1 is off, but I can only see one of the 4 fans moving.
I had a look at the tacho signal from the CPU fan with my oscilloscope and sometimes I see a small dropout during high part of the signal. The signal doesn't drop to 0, just about 30-50%. Do you know the switching point for tacho signal? In the documentation they talk about a TTL signal so low is below 20% and high is over 50% and the fan is outputting as signal in the "undefined area" every so often.
That sounds like a bad fan. I'll have to borrow a scope from work and check mine. Will let you know the results when I do.
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