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Hey,
one of my fans became noisy and I want to figure out which one. Since I have all the rpm readings and interfaces available I can just switch them off one by one via software, must be an easy task right?
# cd /sys/class/hwmon/hwmon4/
# ls
beep_enable in10_min in3_beep in9_max pwm2_auto_point1_temp pwm3_auto_point3_temp temp2_max_hyst
device in11_alarm in3_input in9_min pwm2_auto_point2_pwm pwm3_auto_point4_pwm temp2_offset
fan1_alarm in11_beep in3_max intrusion0_alarm pwm2_auto_point2_temp pwm3_auto_point4_temp temp2_type
fan1_beep in11_input in3_min intrusion0_beep pwm2_auto_point3_pwm pwm3_auto_point5_pwm temp3_input
fan1_input in11_max in4_alarm intrusion1_alarm pwm2_auto_point3_temp pwm3_auto_point5_temp temp3_label
fan1_min in11_min in4_beep intrusion1_beep pwm2_auto_point4_pwm pwm3_crit_temp_tolerance temp3_offset
fan1_pulses in12_alarm in4_input name pwm2_auto_point4_temp pwm3_enable temp3_type
fan1_target in12_beep in4_max power pwm2_auto_point5_pwm pwm3_floor temp4_input
fan1_tolerance in12_input in4_min pwm1 pwm2_auto_point5_temp pwm3_mode temp4_label
fan2_alarm in12_max in5_alarm pwm1_auto_point1_pwm pwm2_crit_temp_tolerance pwm3_start temp4_offset
fan2_beep in12_min in5_beep pwm1_auto_point1_temp pwm2_enable pwm3_step_down_time temp4_type
fan2_input in13_alarm in5_input pwm1_auto_point2_pwm pwm2_floor pwm3_step_up_time temp5_input
fan2_min in13_beep in5_max pwm1_auto_point2_temp pwm2_mode pwm3_stop_time temp5_label
fan2_pulses in13_input in5_min pwm1_auto_point3_pwm pwm2_start pwm3_target_temp temp5_offset
fan2_target in13_max in6_alarm pwm1_auto_point3_temp pwm2_step_down_time pwm3_temp_sel temp5_type
fan2_tolerance in13_min in6_beep pwm1_auto_point4_pwm pwm2_step_up_time pwm3_temp_tolerance temp6_input
fan3_alarm in14_alarm in6_input pwm1_auto_point4_temp pwm2_stop_time subsystem temp6_label
fan3_beep in14_beep in6_max pwm1_auto_point5_pwm pwm2_target_temp temp10_input temp6_offset
fan3_input in14_input in6_min pwm1_auto_point5_temp pwm2_temp_sel temp10_label temp6_type
fan3_min in14_max in7_alarm pwm1_crit_temp_tolerance pwm2_temp_tolerance temp1_alarm temp7_input
fan3_pulses in14_min in7_beep pwm1_enable pwm2_weight_duty_base temp1_beep temp7_label
fan3_target in1_alarm in7_input pwm1_floor pwm2_weight_duty_step temp1_input temp8_input
fan3_tolerance in1_beep in7_max pwm1_mode pwm2_weight_temp_sel temp1_label temp8_label
in0_alarm in1_input in7_min pwm1_start pwm2_weight_temp_step temp1_max temp9_input
in0_beep in1_max in8_alarm pwm1_step_down_time pwm2_weight_temp_step_base temp1_max_hyst temp9_label
in0_input in1_min in8_beep pwm1_step_up_time pwm2_weight_temp_step_tol temp1_offset uevent
in0_max in2_alarm in8_input pwm1_stop_time pwm3 temp1_type
in0_min in2_beep in8_max pwm1_target_temp pwm3_auto_point1_pwm temp2_alarm
in10_alarm in2_input in8_min pwm1_temp_sel pwm3_auto_point1_temp temp2_beep
in10_beep in2_max in9_alarm pwm1_temp_tolerance pwm3_auto_point2_pwm temp2_input
in10_input in2_min in9_beep pwm2 pwm3_auto_point2_temp temp2_label
in10_max in3_alarm in9_input pwm2_auto_point1_pwm pwm3_auto_point3_pwm temp2_maxWhat I tried so far:
# cat pwm1
153
[root@cray hwmon4]# cat pwm1_mode
1
[root@cray hwmon4]# cat pwm1_start
1
[root@cray hwmon4]# echo 0 > pwm1_start // does nothing
[root@cray hwmon4]# cat pwm1_start
1
[root@cray hwmon4]# cat fan1_target
0
[root@cray hwmon4]# echo 0 > fan1_input
bash: fan1_input: Permission denied
[root@cray hwmon4]# cat pwm1_enable
5
[root@cray hwmon4]# echo 0 > pwm1_enable // sets fan to max rpm
[root@cray hwmon4]# echo 1 > pwm1_enable // sets fan to max rpm
[root@cray hwmon4]# echo 2 > pwm1_enable // sets fan to max rpm
[root@cray hwmon4]# echo 3 > pwm1_enable // sets fan to max rpm
[root@cray hwmon4]# echo 4 > pwm1_enable
bash: echo: write error: Invalid argument
[root@cray hwmon4]# echo 5 > pwm1_enable
[root@cray hwmon4]# echo 0 > pwm1_start // does nothing
[root@cray hwmon4]# cat fan1_min
0
[root@cray hwmon4]# cat pwm1_floor
1So yeah I'm lost here, can someon enlighten me what I need to echo to actually disable the fan????
Ty
PS:
Already tried pwmconfig, which rans fine but doesn't help me here. 'fancontrol' only reports the usual "Error: Can't read configuration file".
Last edited by farc (2017-04-22 13:27:24)
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Did you run pwmconfig with superuser privileges (with sudo)?
If so, look in the file /etc/fancontrol .
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The easy solution is to block the fans manually one after another for a short period of time(!) to find out which is the noisy one.
Or you can find out which sensor chip you have and check the meaning and allowed values in the appropriate sub directory of the kernel documentation:
https://www.kernel.org/doc/Documentation/hwmon
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Yes, I ran pwmconfig with sudo.
Stopping by fans is not really the easy solution. First of all I need to open the chassis, which changes the sound already. And then I would also be right next to it, as to normally on my table. (The Noise is very subtle).
pwmconfig list these sensors:
Found the following devices:
hwmon4 is nct6791
and https://www.kernel.org/doc/Documentation/hwmon/nct6775
sysfs attributes
----------------pwm[1-5] - this file stores PWM duty cycle or DC value (fan speed) in range:
0 (lowest speed) to 255 (full)pwm[1-5]_enable - this file controls mode of fan/temperature control:
* 0 Fan control disabled (fans set to maximum speed)
* 1 Manual mode, write to pwm[0-5] any value 0-255
* 2 "Thermal Cruise" mode
* 3 "Fan Speed Cruise" mode
* 4 "Smart Fan III" mode (NCT6775F only)
* 5 "Smart Fan IV" modepwm[1-5]_mode - controls if output is PWM or DC level
* 0 DC output
* 1 PWM output
Ah, there we go, so lets see...
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Yep, that works, ty
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