Re: [lm-sensors] f71882fg-* How do you set temp limits for max_hyst

["David C. Rankin" <drankinatty@suddenlinkmail.com>]

Hans de Goede wrote:
> 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
>>
> 
> <snip>
> 
>>     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 ?
> 

Left you speechless too....

23:18 sq4~> ls /sys/class/hwmon/hwmon*/device
driver      fan3_beep   in1_beep   in7_input    temp1_crit       temp2_beep
   temp3_alarm      temp3_type
fan1_alarm  fan3_input  in1_input  in8_input    temp1_crit_hyst  temp2_crit
   temp3_beep       uevent
fan1_beep   fan4_alarm  in1_max    modalias     temp1_fault
temp2_crit_hyst  temp3_crit
fan1_input  fan4_beep   in2_input  name         temp1_input      temp2_fault
   temp3_crit_hyst
fan2_alarm  fan4_input  in3_input  power        temp1_max        temp2_input
   temp3_fault
fan2_beep   hwmon       in4_input  subsystem    temp1_max_hyst   temp2_max
   temp3_input
fan2_input  in0_input   in5_input  temp1_alarm  temp1_type       temp2_max_hyst
  temp3_max
fan3_alarm  in1_alarm   in6_input  temp1_beep   temp2_alarm      temp2_type
   temp3_max_hyst

	Looking closer at the temp*, some are 0:

23:27 sq4~> ls -l /sys/devices/platform/f71882fg.2560/temp*
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp1_alarm
-rw-r--r-- 1 root root 4096 2008-10-20 23:19
/sys/devices/platform/f71882fg.2560/temp1_beep
-rw-r--r-- 1 root root    0 2008-10-20 00:00
/sys/devices/platform/f71882fg.2560/temp1_crit
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp1_crit_hyst
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp1_fault
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp1_input
-rw-r--r-- 1 root root    0 2008-10-20 00:00
/sys/devices/platform/f71882fg.2560/temp1_max
-rw-r--r-- 1 root root    0 2008-10-19 21:29
/sys/devices/platform/f71882fg.2560/temp1_max_hyst
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp1_type
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp2_alarm
-rw-r--r-- 1 root root 4096 2008-10-20 23:19
/sys/devices/platform/f71882fg.2560/temp2_beep
-rw-r--r-- 1 root root    0 2008-10-20 00:00
/sys/devices/platform/f71882fg.2560/temp2_crit
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp2_crit_hyst
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp2_fault
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp2_input
-rw-r--r-- 1 root root    0 2008-10-20 00:00
/sys/devices/platform/f71882fg.2560/temp2_max
-rw-r--r-- 1 root root    0 2008-10-19 21:29
/sys/devices/platform/f71882fg.2560/temp2_max_hyst
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp2_type
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_alarm
-rw-r--r-- 1 root root 4096 2008-10-20 23:19
/sys/devices/platform/f71882fg.2560/temp3_beep
-rw-r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_crit
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_crit_hyst
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_fault
-r--r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_input
-rw-r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_max
-rw-r--r-- 1 root root 4096 2008-10-19 21:18
/sys/devices/platform/f71882fg.2560/temp3_max_hyst

	All of the hyst devices are there. I don't know why it is giving the errors on
set. However, I wonder if the way it is symlinked could be causing the
problems? Note above, the actual /sys directory for the values is:

/sys/devices/platform/f71882fg.2560/
	

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

	Blind faith required.... A quick check first:

23:33 sq4~> cat /sys/devices/platform/f71882fg.2560/temp1_max_hyst
51000

	Hmm, 51000, and that is what the temp1_max_hyst shows with sensors:

23:35 sq4~> sensors
f71882fg-isa-0a00
Adapter: ISA adapter
<snip>
CPU:         +28.0°C  (high = +55.0°C, hyst = +51.0°C)
                      (crit = +60.0°C, hyst = +56.0°C)  sensor = thermistor
System:      +32.0°C  (high = +55.0°C, hyst = +51.0°C)
                      (crit = +60.0°C, hyst = +56.0°C)  sensor = transistor

	OK, I'll try 50000 since that is actually what I wanted to set the max_hyst to:

[23:39 sq4/home/david] # echo -n 50000 >
/sys/class/hwmon/hwmon0/device/temp1_max_hyst
[23:40 sq4/home/david] # echo -n 50000 >
/sys/class/hwmon/hwmon0/device/temp2_max_hyst

[23:40 sq4/home/david] # sensors
f71882fg-isa-0a00
Adapter: ISA adapter
<snip>
CPU:         +28.0°C  (high = +55.0°C, hyst = +50.0°C)
                      (crit = +60.0°C, hyst = +55.0°C)  sensor = thermistor
System:      +31.0°C  (high = +55.0°C, hyst = +50.0°C)
                      (crit = +60.0°C, hyst = +55.0°C)  sensor = transistor

	Well that worked nicely! Now why wouldn't it accept the set variables from the
sensors3.conf file? Let's try again. A quick vi of sensors3.conf leaving:

# Set CPU and System temp limits

    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

	WTF? It worked! Hmm..., something is fishy here. Let's do another test:

23:42 sq4~> sudo echo -n 50000 > /sys/class/hwmon/hwmon0/device/temp1_max_hyst
-bash: /sys/class/hwmon/hwmon0/device/temp1_max_hyst: Permission denied

	$%#@%^@$%$ing sudo! I see the problem, but I don't know why. When the error
was generated, I was running sensors -s with sudo "sudo sensors -s" which has
always worked before with all my other boxes. I wonder what the deal is here.
Mystery solved, and another one to track down -- normal...

> 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.

	Yep, the above file permission bear that out.

> 
> 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?
> 
> Regards,
> 
> Hans
> 

	Thank you Hans. Bitten by sudo. At least we know libsensors is as good as ever
and it was just another "id ten t" error. (change the text within the quotes to
all-caps and numerical 10 and remove the spaces)...

-- 
David C. Rankin, J.D., P.E.
Rankin Law Firm, PLLC
www.rankinlawfirm.com

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