On 08/16/2013 01:57 PM, Guenter Roeck wrote: > It just changes the pwm polarity from active low to active high unless > fan control is set to automatic mode. That doesn't damage anything. Good to know. > Does automatic fan control for the drive bay fan work if you don't load > the driver ? Also, what kernel log message do you get when you load the > driver with or without the parameter ? I don't believe so. Without the module loaded the fan seems to always run at about 75% of its maximum speed. It is hard to be 100% sure, because the temperatures reported by the IT8728F don't seem to ever vary by more than a few degrees, even when coretemp reports significant changes (around 20 degrees). So it's possible that automatic fan control is "working," but getting garbage input. If I load the module after a cold-boot without the parameter, I get: it87 it87.656: Detected broken BIOS defaults, disabling PWM interface Once I've loaded it with the fix_pwm_polarity=1 one time, I can unload/ reload the module without any special parameters, and PWM continues to work. IIRC, this is true across warm reboots. Note that bad/incomplete setup by the BIOS appears to be somewhat common on this hardware. This is a Thecus N5550 NAS, and the manufacturer expects people to run their Linux-based "firmware." Their add-on kernel modules do some setup work (configuring ICH GPIOs) which would normally be done by the BIOS. HTH -- ======================================================================== Ian Pilcher arequipeno@xxxxxxxxx Sometimes there's nothing left to do but crash and burn...or die trying. ======================================================================== _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
