- The standard lm-sensors package that comes with my distribution, (i:3.3.1/Ubuntu), does not include support for setting PWM fan speeds.
- By downloading and compiling the nct6775 module from https://github.com/groeck/nct6775 these things work to statisfaction.
- Temperatures as read from the chipset is low. Compared to temperatures measured by a thermometer in the case they are lower and does not go up as quickly when they system load increases. I.e. my idle system have a chipset temperature of 28 Degrees - they temperature in the case is meassured to 32. The loaded system reports a chipset temperature of 32 but the thermometer in the case reports 44!
- Case temperature as read from the acpiz module are identical though.
- hysteresis values, i.e. pwm3_auto_point1_temp_hyst, behave strange. It is depenant on the corresponding temp field and often takes negative values.
- In Thermal Cruise mode it sometimes stops the fan completely which I consider unnecessary. I was not able to prevent this.
- Otherwise I was successful in setting up proper regulation of my pwm case fans depending on the case temprature. Some examples follows
# 'Manual mode' (1) setting pwm duty cycle explicityly:
echo "1" > /sys/devices/platform/nct6775.656/pwm3_enable
echo "130" > /sys/devices/platform/nct6775.656/pwm3
# 'Thermal Cruise' (2) mode. The fan is regulated to maintain a target temperature
echo "2" > /sys/devices/platform/nct6775.656/pwm3_enable
echo "1" > /sys/devices/platform/nct6775.656/pwm3_mode
echo "100" > /sys/devices/platform/nct6775.656/pwm3_start_output
echo "100" > /sys/devices/platform/nct6775.656/pwm3_step_down_time
echo "100" > /sys/devices/platform/nct6775.656/pwm3_step_up_time
echo "90" > /sys/devices/platform/nct6775.656/pwm3_stop_output
echo "6000" > /sys/devices/platform/nct6775.656/pwm3_stop_time
echo "28000" > /sys/devices/platform/nct6775.656/pwm3_target
echo "1" > /sys/devices/platform/nct6775.656/pwm3_temp_sel
echo "0" > /sys/devices/platform/nct6775.656/pwm3_weight_duty_base
echo "0" > /sys/devices/platform/nct6775.656/pwm3_weight_duty_step
echo "0" > /sys/devices/platform/nct6775.656/pwm3_weight_enable
echo "1" > /sys/devices/platform/nct6775.656/pwm3_weight_temp_sel
echo "0" > /sys/devices/platform/nct6775.656/pwm3_weight_temp_step
echo "0" > /sys/devices/platform/nct6775.656/pwm3_weight_temp_step_base
echo "0" > /sys/devices/platform/nct6775.656/pwm3_weight_temp_step_tol
# 'Smart Fan IV' (5) mode. The fan is regulated to maintain a target temperature.
echo "100" > /sys/devices/platform/nct6775.656/pwm4_auto_point1_pwm
echo "28000" > /sys/devices/platform/nct6775.656/pwm4_auto_point1_temp
echo "120" > /sys/devices/platform/nct6775.656/pwm4_auto_point2_pwm
echo "34000" > /sys/devices/platform/nct6775.656/pwm4_auto_point2_temp
echo "150" > /sys/devices/platform/nct6775.656/pwm4_auto_point3_pwm
echo "38000" > /sys/devices/platform/nct6775.656/pwm4_auto_point3_temp
echo "200" > /sys/devices/platform/nct6775.656/pwm4_auto_point4_pwm
echo "42000" > /sys/devices/platform/nct6775.656/pwm4_auto_point4_temp
echo "255" > /sys/devices/platform/nct6775.656/pwm4_auto_point5_pwm
echo "46000" > /sys/devices/platform/nct6775.656/pwm4_auto_point5_temp
echo "5" > /sys/devices/platform/nct6775.656/pwm4_enable
echo "1" > /sys/devices/platform/nct6775.656/pwm4_mode
echo "100" > /sys/devices/platform/nct6775.656/pwm4_start_output
echo "100" > /sys/devices/platform/nct6775.656/pwm4_step_down_time
echo "100" > /sys/devices/platform/nct6775.656/pwm4_step_up_time
echo "90" > /sys/devices/platform/nct6775.656/pwm4_stop_output
echo "6000" > /sys/devices/platform/nct6775.656/pwm4_stop_time
echo "28000" > /sys/devices/platform/nct6775.656/pwm4_target
echo "1" > /sys/devices/platform/nct6775.656/pwm4_temp_sel
# Output of sensors -u before customizations.
acpitz-virtual-0
Adapter: Virtual device
temp1:
temp1_input: 27.800
temp1_crit: 104.000
temp2:
temp2_input: 29.800
temp2_crit: 104.000
nct6779-isa-0290
Adapter: ISA adapter
in0:
in0_input: 1.040
in0_min: 0.000
in0_max: 1.744
in0_alarm: 0.000
in1:
in1_input: 1.008
in1_min: 0.000
in1_max: 0.000
in1_alarm: 1.000
in2:
in2_input: 3.392
in2_min: 0.000
in2_max: 0.000
in2_alarm: 1.000
in3:
in3_input: 3.392
in3_min: 0.000
in3_max: 0.000
in3_alarm: 1.000
in4:
in4_input: 1.024
in4_min: 0.000
in4_max: 0.000
in4_alarm: 1.000
in5:
in5_input: 2.040
in5_min: 0.000
in5_max: 0.000
in5_alarm: 1.000
in6:
in6_input: 0.272
in6_min: 0.000
in6_max: 0.000
in6_alarm: 1.000
in7:
in7_input: 3.392
in7_min: 0.000
in7_max: 0.000
in7_alarm: 1.000
in8:
in8_input: 3.296
in8_min: 0.000
in8_max: 0.000
in8_alarm: 1.000
in9:
in9_input: 1.056
in9_min: 0.000
in9_max: 0.000
in9_alarm: 1.000
in10:
in10_input: 0.216
in10_min: 0.000
in10_max: 0.000
in10_alarm: 1.000
in11:
in11_input: 0.168
in11_min: 0.000
in11_max: 0.000
in11_alarm: 1.000
in12:
in12_input: 0.168
in12_min: 0.000
in12_max: 0.000
in12_alarm: 1.000
in13:
in13_input: 0.152
in13_min: 0.000
in13_max: 0.000
in13_alarm: 1.000
in14:
in14_input: 0.176
in14_min: 0.000
in14_max: 0.000
in14_alarm: 1.000
fan1:
fan1_input: 0.000
fan1_min: 0.000
fan1_alarm: 0.000
fan2:
fan2_input: 1021.000
fan2_min: 0.000
fan2_alarm: 0.000
fan3:
fan3_input: 1616.000
fan3_min: 0.000
fan3_alarm: 0.000
fan4:
fan4_input: 1646.000
fan4_min: 0.000
fan4_alarm: 0.000
fan5:
fan5_input: 0.000
fan5_min: 0.000
fan5_alarm: 0.000
SYSTIN:
temp1_input: 26.000
temp1_max: 0.000
temp1_max_hyst: 0.000
temp1_alarm: 1.000
temp1_type: 4.000
temp1_offset: 0.000
CPUTIN:
temp2_input: 38.000
temp2_max: 80.000
temp2_max_hyst: 75.000
temp2_alarm: 0.000
temp2_type: 4.000
temp2_offset: 0.000
AUXTIN0:
temp3_input: 105.000
temp3_alarm: 0.000
temp3_type: 4.000
temp3_offset: 0.000
AUXTIN1:
temp4_input: 106.000
temp4_type: 4.000
temp4_offset: 0.000
AUXTIN2:
temp5_input: 106.000
temp5_type: 4.000
temp5_offset: 0.000
AUXTIN3:
temp6_input: 17.000
temp6_type: 3.000
temp6_offset: 0.000
PCH_CHIP_CPU_MAX_TEMP:
temp7_input: 0.000
PCH_CHIP_TEMP:
temp8_input: 0.000
PCH_CPU_TEMP:
temp9_input: 0.000
PCH_MCH_TEMP:
temp10_input: 0.000
cpu0_vid:
cpu0_vid: 0.000
intrusion0:
intrusion0_alarm: 1.000
intrusion1:
intrusion1_alarm: 1.000
# output of: grep . /sys/devices/platform/nct6775.656/pwm*
/sys/devices/platform/nct6775.656/pwm1:255
/sys/devices/platform/nct6775.656/pwm1_auto_point1_pwm:255
/sys/devices/platform/nct6775.656/pwm1_auto_point1_temp:0
/sys/devices/platform/nct6775.656/pwm1_auto_point1_temp_hyst:0
/sys/devices/platform/nct6775.656/pwm1_auto_point2_pwm:255
/sys/devices/platform/nct6775.656/pwm1_auto_point2_temp:0
/sys/devices/platform/nct6775.656/pwm1_auto_point2_temp_hyst:0
/sys/devices/platform/nct6775.656/pwm1_auto_point3_pwm:255
/sys/devices/platform/nct6775.656/pwm1_auto_point3_temp:0
/sys/devices/platform/nct6775.656/pwm1_auto_point3_temp_hyst:0
/sys/devices/platform/nct6775.656/pwm1_auto_point4_pwm:255
/sys/devices/platform/nct6775.656/pwm1_auto_point4_temp:0
/sys/devices/platform/nct6775.656/pwm1_auto_point4_temp_hyst:0
/sys/devices/platform/nct6775.656/pwm1_auto_point5_pwm:255
/sys/devices/platform/nct6775.656/pwm1_auto_point5_temp:75000
/sys/devices/platform/nct6775.656/pwm1_auto_point5_temp_hyst:73000
/sys/devices/platform/nct6775.656/pwm1_enable:5
/sys/devices/platform/nct6775.656/pwm1_mode:1
/sys/devices/platform/nct6775.656/pwm1_start_output:1
/sys/devices/platform/nct6775.656/pwm1_step_down_time:100
/sys/devices/platform/nct6775.656/pwm1_step_up_time:100
/sys/devices/platform/nct6775.656/pwm1_stop_output:1
/sys/devices/platform/nct6775.656/pwm1_stop_output_enable:0
/sys/devices/platform/nct6775.656/pwm1_stop_time:6000
/sys/devices/platform/nct6775.656/pwm1_target:0
/sys/devices/platform/nct6775.656/pwm1_temp_sel:0
/sys/devices/platform/nct6775.656/pwm1_weight_duty_base:0
/sys/devices/platform/nct6775.656/pwm1_weight_duty_step:0
/sys/devices/platform/nct6775.656/pwm1_weight_enable:0
/sys/devices/platform/nct6775.656/pwm1_weight_temp_sel:1
/sys/devices/platform/nct6775.656/pwm1_weight_temp_step:0
/sys/devices/platform/nct6775.656/pwm1_weight_temp_step_base:0
/sys/devices/platform/nct6775.656/pwm1_weight_temp_step_tol:0
/sys/devices/platform/nct6775.656/pwm2:86
/sys/devices/platform/nct6775.656/pwm2_auto_point1_pwm:51
/sys/devices/platform/nct6775.656/pwm2_auto_point1_temp:20000
/sys/devices/platform/nct6775.656/pwm2_auto_point1_temp_hyst:20000
/sys/devices/platform/nct6775.656/pwm2_auto_point2_pwm:178
/sys/devices/platform/nct6775.656/pwm2_auto_point2_temp:70000
/sys/devices/platform/nct6775.656/pwm2_auto_point2_temp_hyst:70000
/sys/devices/platform/nct6775.656/pwm2_auto_point3_pwm:255
/sys/devices/platform/nct6775.656/pwm2_auto_point3_temp:75000
/sys/devices/platform/nct6775.656/pwm2_auto_point3_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm2_auto_point4_pwm:255
/sys/devices/platform/nct6775.656/pwm2_auto_point4_temp:75000
/sys/devices/platform/nct6775.656/pwm2_auto_point4_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm2_auto_point5_pwm:255
/sys/devices/platform/nct6775.656/pwm2_auto_point5_temp:75000
/sys/devices/platform/nct6775.656/pwm2_auto_point5_temp_hyst:73000
/sys/devices/platform/nct6775.656/pwm2_enable:5
/sys/devices/platform/nct6775.656/pwm2_mode:1
/sys/devices/platform/nct6775.656/pwm2_start_output:1
/sys/devices/platform/nct6775.656/pwm2_step_down_time:100
/sys/devices/platform/nct6775.656/pwm2_step_up_time:100
/sys/devices/platform/nct6775.656/pwm2_stop_output:1
/sys/devices/platform/nct6775.656/pwm2_stop_output_enable:0
/sys/devices/platform/nct6775.656/pwm2_stop_time:6000
/sys/devices/platform/nct6775.656/pwm2_target:50000
/sys/devices/platform/nct6775.656/pwm2_temp_sel:0
/sys/devices/platform/nct6775.656/pwm2_weight_duty_base:0
/sys/devices/platform/nct6775.656/pwm2_weight_duty_step:0
/sys/devices/platform/nct6775.656/pwm2_weight_enable:0
/sys/devices/platform/nct6775.656/pwm2_weight_temp_sel:1
/sys/devices/platform/nct6775.656/pwm2_weight_temp_step:0
/sys/devices/platform/nct6775.656/pwm2_weight_temp_step_base:0
/sys/devices/platform/nct6775.656/pwm2_weight_temp_step_tol:0
/sys/devices/platform/nct6775.656/pwm3:162
/sys/devices/platform/nct6775.656/pwm3_auto_point1_pwm:153
/sys/devices/platform/nct6775.656/pwm3_auto_point1_temp:30000
/sys/devices/platform/nct6775.656/pwm3_auto_point1_temp_hyst:30000
/sys/devices/platform/nct6775.656/pwm3_auto_point2_pwm:255
/sys/devices/platform/nct6775.656/pwm3_auto_point2_temp:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point2_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point3_pwm:255
/sys/devices/platform/nct6775.656/pwm3_auto_point3_temp:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point3_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point4_pwm:255
/sys/devices/platform/nct6775.656/pwm3_auto_point4_temp:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point4_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point5_pwm:255
/sys/devices/platform/nct6775.656/pwm3_auto_point5_temp:75000
/sys/devices/platform/nct6775.656/pwm3_auto_point5_temp_hyst:73000
/sys/devices/platform/nct6775.656/pwm3_enable:5
/sys/devices/platform/nct6775.656/pwm3_mode:1
/sys/devices/platform/nct6775.656/pwm3_start_output:1
/sys/devices/platform/nct6775.656/pwm3_step_down_time:100
/sys/devices/platform/nct6775.656/pwm3_step_up_time:100
/sys/devices/platform/nct6775.656/pwm3_stop_output:1
/sys/devices/platform/nct6775.656/pwm3_stop_output_enable:0
/sys/devices/platform/nct6775.656/pwm3_stop_time:6000
/sys/devices/platform/nct6775.656/pwm3_target:0
/sys/devices/platform/nct6775.656/pwm3_temp_sel:0
/sys/devices/platform/nct6775.656/pwm3_weight_duty_base:0
/sys/devices/platform/nct6775.656/pwm3_weight_duty_step:0
/sys/devices/platform/nct6775.656/pwm3_weight_enable:0
/sys/devices/platform/nct6775.656/pwm3_weight_temp_sel:1
/sys/devices/platform/nct6775.656/pwm3_weight_temp_step:0
/sys/devices/platform/nct6775.656/pwm3_weight_temp_step_base:0
/sys/devices/platform/nct6775.656/pwm3_weight_temp_step_tol:0
/sys/devices/platform/nct6775.656/pwm4:162
/sys/devices/platform/nct6775.656/pwm4_auto_point1_pwm:153
/sys/devices/platform/nct6775.656/pwm4_auto_point1_temp:30000
/sys/devices/platform/nct6775.656/pwm4_auto_point1_temp_hyst:30000
/sys/devices/platform/nct6775.656/pwm4_auto_point2_pwm:255
/sys/devices/platform/nct6775.656/pwm4_auto_point2_temp:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point2_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point3_pwm:255
/sys/devices/platform/nct6775.656/pwm4_auto_point3_temp:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point3_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point4_pwm:255
/sys/devices/platform/nct6775.656/pwm4_auto_point4_temp:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point4_temp_hyst:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point5_pwm:255
/sys/devices/platform/nct6775.656/pwm4_auto_point5_temp:75000
/sys/devices/platform/nct6775.656/pwm4_auto_point5_temp_hyst:73000
/sys/devices/platform/nct6775.656/pwm4_enable:5
/sys/devices/platform/nct6775.656/pwm4_mode:1
/sys/devices/platform/nct6775.656/pwm4_start_output:1
/sys/devices/platform/nct6775.656/pwm4_step_down_time:100
/sys/devices/platform/nct6775.656/pwm4_step_up_time:100
/sys/devices/platform/nct6775.656/pwm4_stop_output:1
/sys/devices/platform/nct6775.656/pwm4_stop_output_enable:0
/sys/devices/platform/nct6775.656/pwm4_stop_time:6000
/sys/devices/platform/nct6775.656/pwm4_target:0
/sys/devices/platform/nct6775.656/pwm4_temp_sel:0
/sys/devices/platform/nct6775.656/pwm4_weight_duty_base:0
/sys/devices/platform/nct6775.656/pwm4_weight_duty_step:0
/sys/devices/platform/nct6775.656/pwm4_weight_enable:0
/sys/devices/platform/nct6775.656/pwm4_weight_temp_sel:1
/sys/devices/platform/nct6775.656/pwm4_weight_temp_step:0
/sys/devices/platform/nct6775.656/pwm4_weight_temp_step_base:0
/sys/devices/platform/nct6775.656/pwm4_weight_temp_step_tol:0
/sys/devices/platform/nct6775.656/pwm5:255
/sys/devices/platform/nct6775.656/pwm5_auto_point1_pwm:140
/sys/devices/platform/nct6775.656/pwm5_auto_point1_temp:25000
/sys/devices/platform/nct6775.656/pwm5_auto_point1_temp_hyst:25000
/sys/devices/platform/nct6775.656/pwm5_auto_point2_pwm:170
/sys/devices/platform/nct6775.656/pwm5_auto_point2_temp:35000
/sys/devices/platform/nct6775.656/pwm5_auto_point2_temp_hyst:35000
/sys/devices/platform/nct6775.656/pwm5_auto_point3_pwm:200
/sys/devices/platform/nct6775.656/pwm5_auto_point3_temp:45000
/sys/devices/platform/nct6775.656/pwm5_auto_point3_temp_hyst:45000
/sys/devices/platform/nct6775.656/pwm5_auto_point4_pwm:230
/sys/devices/platform/nct6775.656/pwm5_auto_point4_temp:55000
/sys/devices/platform/nct6775.656/pwm5_auto_point4_temp_hyst:55000
/sys/devices/platform/nct6775.656/pwm5_auto_point5_pwm:255
/sys/devices/platform/nct6775.656/pwm5_auto_point5_temp:60000
/sys/devices/platform/nct6775.656/pwm5_auto_point5_temp_hyst:60000
/sys/devices/platform/nct6775.656/pwm5_enable:0
/sys/devices/platform/nct6775.656/pwm5_mode:1
/sys/devices/platform/nct6775.656/pwm5_start_output:1
/sys/devices/platform/nct6775.656/pwm5_step_down_time:1000
/sys/devices/platform/nct6775.656/pwm5_step_up_time:1000
/sys/devices/platform/nct6775.656/pwm5_stop_output:1
/sys/devices/platform/nct6775.656/pwm5_stop_output_enable:0
/sys/devices/platform/nct6775.656/pwm5_stop_time:6000
/sys/devices/platform/nct6775.656/pwm5_target:0
/sys/devices/platform/nct6775.656/pwm5_temp_sel:3
/sys/devices/platform/nct6775.656/pwm5_weight_duty_base:0
/sys/devices/platform/nct6775.656/pwm5_weight_duty_step:0
/sys/devices/platform/nct6775.656/pwm5_weight_enable:0
/sys/devices/platform/nct6775.656/pwm5_weight_temp_sel:1
/sys/devices/platform/nct6775.656/pwm5_weight_temp_step:0
/sys/devices/platform/nct6775.656/pwm5_weight_temp_step_base:0
/sys/devices/platform/nct6775.656/pwm5_weight_temp_step_tol:0
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