2014/1/16 Jean Delvare <khali@xxxxxxxxxxxx>: Hi Jean, >> compute temp3 @+10,@+10 > > Preferred way of doing this when the hardware supports it (and the > IT8728F does) is: > > set temp3_offset 10 > > That being said I am not 100% positive that this works when the > temperature sensor type is PECI. You'll have to try it out and see. I have did some testing, but I'm not sure yet what to report. I don't have a clear picture with repeatable results yet. Offset values are by default not 0, does lm_sensors init script reset offset values to default when removed from sensors.conf?, should I compile sensor drivers as modules? (currently they are in the kernel, so my init script fails when it tries to reload the modules), sometimes I get negative values for _input when I switch from compute to offset statement, why does compute +10 add 20 to reported values? Actually, I think my most important question is: how does the compute statement work? >> (Note: I wonder if this is influenced by my BIOS settings, which >> allows me to change the temperature for CPU warning.) > > It should indeed be. It's easy enough to try. Answer after some testing: bios configuration defines the temp3_max value. > It is possible that the board actually has two board sensors, even if > the BIOS doesn't report both. As long as the values make sense and move > in a realistic way, there is no reason to discard them. I have put high load on both CPU and GPU, which automatically increases case temp. Both temp1 and temp2 increase equally. So I assume you are right, the board has 2 sensors but the bios only reports 1. >> I currently believe that my last two questions are: >> >> 10. How are temp1_min and temp1_max determined for the it8728 reportes >> temperatures? > > They are arbitrary limits that can be set by the BIOS or the user. Min > isn't so useful unless you live in Alaska or leave you system outside > in winter. Max is more useful but only if some action is triggered by > the alarm flag raising, either in the hardware or by software polling > for the alarm flag. As expected, thanks! >> 11. What is temp1_type and temp1_offset? > > The sensor type (thermistor, thermal diode or digital aka PECI) and an > offset that can be added by the hardware automatically, respectively. > > You normally don't have to change the sensor type as it should be set > right by the BIOS. The type OTOH gives you a hint on what is what: > board sensors are typically thermistors while CPU sensors are typically > thermal diodes or PECI. > > Setting the offset attribute is equivalent to a simple compute formula, > as stated above, and is more efficient as it is done by the hardware. > It is also more convenient if you start playing with temperature-based > fan speed control. Thanks, this helps! So I only have to figure out how to get the values right for temp3 and the interaction between offset and compute values :-) Regards, Martin _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
