[lm-sensors] f71882fg-* How do you set temp limits for max_hyst and crit_hyst?

Hans de Goede j.w.r.degoede at hhs.nl
Mon Oct 20 09:08:18 CEST 2008

David C. Rankin wrote:
> sensor Devs,
> 	I have an MSI K9N2 SLI Platinum board that has the f71882fg- chip. I am unable
> to set the tempX_max_hyst and tempX_crit_hyst temperature limits with
> sensors-3.0.2-4.1. Attempting to set the values results in the normal error
> messages on sensors -s:
> Error: Line 70: Unknown feature name
> Error: Line 71: Unknown feature name


>     set temp1_max_hyst 50
>     set temp1_max 55
>     set temp1_crit_hyst 56
>     set temp1_crit 60
>     set temp2_max_hyst 50
>     set temp2_max 55
>     set temp2_crit_hyst 56
>     set temp2_crit 60
> 	However, all of the _hyst settings result in the errors explained above. So,
> how do you set the hyst limits with this chipset?

Erm, that should work. What does ls /sys/class/hwmon/hwmon*/device show ?

If there are temp#_max_hyst files there try:
echo -n 56000 > /sys/class/hwmon/hwmon#/device/temp#_max_hyst

Note that the hysteresis is shared between max and crit, so only the 
temp#_max_hyst attributes are writable the temp#_crit_hyst attributes are readonly.

If the echo works and your sensors.conf still gives errors after removing the 
set statements for temp#_crit_hyst, we probably have a bug in libsensors or 
sensors somewhere.

> 	If you need additional information, please just ask and I'll be glad to
> provide it. Also, I tried enabling temp3 and that resulted in a wild value of
> 127 deg.C which is way off-scale high. Any ideas what this sensor does?

127 looks like not connected to me, I would expect the output of "sensors" to 
give a FAULT as reading for that sensors, what does:
cat /sys/class/hwmon/hwmon#/device/temp3_fault
Give as output?



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