From: Guenter Roeck Date: Sun, 18 Mar 2012 00:22:32 +0000 (-0700) Subject: Add NCT6776F usage note X-Git-Tag: nct6775-v0.9~40 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=bce353c593756b860b45ff98d6bd5c3ae0874ac4;p=groeck-nct6775 Add NCT6776F usage note Signed-off-by: Guenter Roeck --- diff --git a/README b/README index 6ca0119..9719053 100644 --- a/README +++ b/README @@ -135,6 +135,29 @@ This modes tries to keep the fan speed constant. Untested; use at your own risk. +Usage Notes +----------- + +On some motherboards with NCT6776F, temperature readings for CPUTIN and AUXTIN +are not correct. In addition, the reported CPUTIN may be _lower_ if the CPU load +increases. + +On an ASUS P8H67V board, the observed relationship between measured and real +temperatures was approximately + T(cpu,real) = 80 - (T(cpu,measured) / 2) + T(aux,real) = T(aux,measured) - 30000 +if the thermal sensor type was set to "thermistor(4)". + +The reported value for CPUTIN sometimes jumps significantly, up to 10 degrees C +between measurements. Changing the sensor types on that board to diode(1) or +thermal diode (3) did not help. + +The problem with AUXTIN can possibly be addressed by setting temp3_offset to +-30000. It is currently unknown, however, if the AUXTIN sensor is actually +connected to anything. The CPUTIN sensor is obviously connected to something, +but how the reported temperature relates to the real world is unknown. + + Implementation Details ----------------------