Further followup ticket 1833 i2cdump showed the chip at 0x2f on the i2c bus to be a winbond type chip. I was able to follow the instructions on the web page and do insmod w83781d force_w83781d=0,0x2f We then saw the following: w83781d-i2c-0-2f Adapter: SMBus I801 adapter at 0540 VCore 1: +2.64 V (min = +2.37 V, max = +3.17 V) (beep) VCore 2: +2.66 V (min = +2.37 V, max = +3.17 V) (beep) +3.3V: +1.31 V (min = +3.14 V, max = +3.46 V) (beep) +5V: +2.05 V (min = +4.74 V, max = +5.24 V) (beep) +12V: +4.48 V (min = +11.36 V, max = +12.58 V) ALARM (beep) -12V: -8.73 V (min = -12.59 V, max = -11.33 V) ALARM (beep) -5V: -4.98 V (min = -5.25 V, max = -4.74 V) ALARM (beep) fan1: 0 RPM (min = 2848 RPM, div = 2) (beep) fan2: 10887 RPM (min = 5696 RPM, div = 1) (beep) fan3: 1298 RPM (min = 712 RPM, div = 8) ALARM (beep) temp1: +47C (high = +127C, hyst = +0C) (beep) temp2: +41.0C (high = +78C, hyst = +68C) ALARM (beep) temp3: +48.5C (high = +78C, hyst = +68C) ALARM (beep) vid: +3.400 V (VRM Version 8.2) alarms: beep_enable: Sound alarm enabled The two temperatures on this chip, temp2 and temp3, go up and down with load as expected. temp1 appears to be constant. The voltages are likely garbage but I am not concerned with that anyway. The fan rpms fan2 and fan3, have non-zero readings on the slots where they are expected, but not the right readings, should be about 5100-5400 rpms apiece. Once this insmod is done, a second chip is detected at 2c as well, which was previously not detectable [root at fnpt126 seti]# sensors w83627hf-i2c-0-2c Adapter: SMBus I801 adapter at 0540 VCore 1: +1.52 V (min = +0.00 V, max = +0.00 V) ALARM VCore 2: +3.38 V (min = +0.00 V, max = +0.00 V) ALARM +3.3V: +3.42 V (min = +3.14 V, max = +3.46 V) +5V: +5.19 V (min = +4.74 V, max = +5.24 V) +12V: +12.46 V (min = +10.83 V, max = +13.19 V) -12V: -11.88 V (min = -13.16 V, max = -10.90 V) -5V: +0.52 V (min = -5.26 V, max = -4.76 V) ALARM V5SB: +5.75 V (min = +4.74 V, max = +5.24 V) ALARM VBat: +0.02 V (min = +2.40 V, max = +3.60 V) ALARM fan1: 0 RPM (min = 3391 RPM, div = 2) ALARM fan2: 0 RPM (min = 5532 RPM, div = 2) ALARM fan3: 0 RPM (min = 39705 RPM, div = 2) ALARM temp1: +31C (high = +80C, hyst = +0C) sensor = thermistor temp2: +29.5C (high = +80C, hyst = +75C) sensor = thermistor temp3: +28.5C (high = +80C, hyst = +75C) sensor = thermistor vid: +0.000 V (VRM Version 8.2) alarms: Chassis intrusion detection ALARM beep_enable: Sound alarm disabled The temp1 in this configuration corresponds to the system temperature. Steve Timm ------------------------------------------------------------------ Steven C. Timm, Ph.D (630) 840-8525 timm at fnal.gov http://home.fnal.gov/~timm/ Fermilab Computing Div/Core Support Services Dept./Scientific Computing Section Assistant Group Leader, Farms and Clustered Systems Group Lead of Computing Farms Team