What: /sys/class/hwmon/hwmonX/name Description: The chip name. This should be a short, lowercase string, not containing whitespace, dashes, or the wildcard character '*'. This attribute represents the chip name. It is the only mandatory attribute. I2C devices get this attribute created automatically. RO What: /sys/class/hwmon/hwmonX/label Description: A descriptive label that allows to uniquely identify a device within the system. The contents of the label are free-form. RO What: /sys/class/hwmon/hwmonX/update_interval Description: The interval at which the chip will update readings. Unit: millisecond RW Some devices have a variable update rate or interval. This attribute can be used to change it to the desired value. What: /sys/class/hwmon/hwmonX/inY_min Description: Voltage min value. Unit: millivolt RW What: /sys/class/hwmon/hwmonX/inY_lcrit Description: Voltage critical min value. Unit: millivolt RW If voltage drops to or below this limit, the system may take drastic action such as power down or reset. At the very least, it should report a fault. What: /sys/class/hwmon/hwmonX/inY_max Description: Voltage max value. Unit: millivolt RW What: /sys/class/hwmon/hwmonX/inY_crit Description: Voltage critical max value. Unit: millivolt RW If voltage reaches or exceeds this limit, the system may take drastic action such as power down or reset. At the very least, it should report a fault. What: /sys/class/hwmon/hwmonX/inY_input Description: Voltage input value. Unit: millivolt RO Voltage measured on the chip pin. Actual voltage depends on the scaling resistors on the motherboard, as recommended in the chip datasheet. This varies by chip and by motherboard. Because of this variation, values are generally NOT scaled by the chip driver, and must be done by the application. However, some drivers (notably lm87 and via686a) do scale, because of internal resistors built into a chip. These drivers will output the actual voltage. Rule of thumb: drivers should report the voltage values at the "pins" of the chip. What: /sys/class/hwmon/hwmonX/inY_average Description: Average voltage Unit: millivolt RO What: /sys/class/hwmon/hwmonX/inY_lowest Description: Historical minimum voltage Unit: millivolt RO What: /sys/class/hwmon/hwmonX/inY_highest Description: Historical maximum voltage Unit: millivolt RO What: /sys/class/hwmon/hwmonX/inY_reset_history Description: Reset inX_lowest and inX_highest WO What: /sys/class/hwmon/hwmonX/in_reset_history Description: Reset inX_lowest and inX_highest for all sensors WO What: /sys/class/hwmon/hwmonX/inY_label Description: Suggested voltage channel label. Text string Should only be created if the driver has hints about what this voltage channel is being used for, and user-space doesn't. In all other cases, the label is provided by user-space. RO What: /sys/class/hwmon/hwmonX/inY_enable Description: Enable or disable the sensors. When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/cpuY_vid Description: CPU core reference voltage. Unit: millivolt RO Not always correct. What: /sys/class/hwmon/hwmonX/vrm Description: Voltage Regulator Module version number. RW (but changing it should no more be necessary) Originally the VRM standard version multiplied by 10, but now an arbitrary number, as not all standards have a version number. Affects the way the driver calculates the CPU core reference voltage from the vid pins. What: /sys/class/hwmon/hwmonX/inY_rated_min Description: Minimum rated voltage. Unit: millivolt RO What: /sys/class/hwmon/hwmonX/inY_rated_max Description: Maximum rated voltage. Unit: millivolt RO What: /sys/class/hwmon/hwmonX/fanY_min Description: Fan minimum value Unit: revolution/min (RPM) RW What: /sys/class/hwmon/hwmonX/fanY_max Description: Fan maximum value Unit: revolution/min (RPM) Only rarely supported by the hardware. RW What: /sys/class/hwmon/hwmonX/fanY_input Description: Fan input value. Unit: revolution/min (RPM) RO What: /sys/class/hwmon/hwmonX/fanY_div Description: Fan divisor. Integer value in powers of two (1, 2, 4, 8, 16, 32, 64, 128). RW Some chips only support values 1, 2, 4 and 8. Note that this is actually an internal clock divisor, which affects the measurable speed range, not the read value. What: /sys/class/hwmon/hwmonX/fanY_pulses Description: Number of tachometer pulses per fan revolution. Integer value, typically between 1 and 4. RW This value is a characteristic of the fan connected to the device's input, so it has to be set in accordance with the fan model. Should only be created if the chip has a register to configure the number of pulses. In the absence of such a register (and thus attribute) the value assumed by all devices is 2 pulses per fan revolution. What: /sys/class/hwmon/hwmonX/fanY_target Description: Desired fan speed Unit: revolution/min (RPM) RW Only makes sense if the chip supports closed-loop fan speed control based on the measured fan speed. What: /sys/class/hwmon/hwmonX/fanY_label Description: Suggested fan channel label. Text string Should only be created if the driver has hints about what this fan channel is being used for, and user-space doesn't. In all other cases, the label is provided by user-space. RO What: /sys/class/hwmon/hwmonX/fanY_enable Description: Enable or disable the sensors. When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/fanY_fault Description: Reports if a fan has reported failure. - 1: Failed - 0: Ok RO What: /sys/class/hwmon/hwmonX/pwmY Description: Pulse width modulation fan control. Integer value in the range 0 to 255 RW 255 is max or 100%. What: /sys/class/hwmon/hwmonX/pwmY_enable Description: Fan speed control method: - 0: no fan speed control (i.e. fan at full speed) - 1: manual fan speed control enabled (using `pwmY`) - 2+: automatic fan speed control enabled Check individual chip documentation files for automatic mode details. RW What: /sys/class/hwmon/hwmonX/pwmY_mode Description: - 0: DC mode (direct current) - 1: PWM mode (pulse-width modulation) RW What: /sys/class/hwmon/hwmonX/pwmY_freq Description: Base PWM frequency in Hz. Only possibly available when pwmN_mode is PWM, but not always present even then. RW What: /sys/class/hwmon/hwmonX/pwmY_auto_channels_temp Description: Select which temperature channels affect this PWM output in auto mode. Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc... Which values are possible depend on the chip used. RW What: /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_pwm What: /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp What: /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp_hyst Description: Define the PWM vs temperature curve. Number of trip points is chip-dependent. Use this for chips which associate trip points to PWM output channels. RW What: /sys/class/hwmon/hwmonX/tempY_auto_pointZ_pwm What: /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp What: /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp_hyst Description: Define the PWM vs temperature curve. Number of trip points is chip-dependent. Use this for chips which associate trip points to temperature channels. RW What: /sys/class/hwmon/hwmonX/tempY_type Description: Sensor type selection. Integers 1 to 6 RW - 1: CPU embedded diode - 2: 3904 transistor - 3: thermal diode - 4: thermistor - 5: AMD AMDSI - 6: Intel PECI Not all types are supported by all chips What: /sys/class/hwmon/hwmonX/tempY_max Description: Temperature max value. Unit: millidegree Celsius (or millivolt, see below) RW What: /sys/class/hwmon/hwmonX/tempY_min Description: Temperature min value. Unit: millidegree Celsius RW What: /sys/class/hwmon/hwmonX/tempY_max_hyst Description: Temperature hysteresis value for max limit. Unit: millidegree Celsius Must be reported as an absolute temperature, NOT a delta from the max value. RW What: /sys/class/hwmon/hwmonX/tempY_min_hyst Description: Temperature hysteresis value for min limit. Unit: millidegree Celsius Must be reported as an absolute temperature, NOT a delta from the min value. RW What: /sys/class/hwmon/hwmonX/tempY_input Description: Temperature input value. Unit: millidegree Celsius RO What: /sys/class/hwmon/hwmonX/tempY_crit Description: Temperature critical max value, typically greater than corresponding temp_max values. Unit: millidegree Celsius RW What: /sys/class/hwmon/hwmonX/tempY_crit_alarm Description: Critical high temperature alarm flag. - 0: OK - 1: temperature has reached tempY_crit RW Contrary to regular alarm flags which clear themselves automatically when read, this one sticks until cleared by the user. This is done by writing 0 to the file. Writing other values is unsupported. What: /sys/class/hwmon/hwmonX/tempY_crit_hyst Description: Temperature hysteresis value for critical limit. Unit: millidegree Celsius Must be reported as an absolute temperature, NOT a delta from the critical value. RW What: /sys/class/hwmon/hwmonX/tempY_emergency Description: Temperature emergency max value, for chips supporting more than two upper temperature limits. Must be equal or greater than corresponding temp_crit values. Unit: millidegree Celsius RW What: /sys/class/hwmon/hwmonX/tempY_emergency_hyst Description: Temperature hysteresis value for emergency limit. Unit: millidegree Celsius Must be reported as an absolute temperature, NOT a delta from the emergency value. RW What: /sys/class/hwmon/hwmonX/tempY_lcrit Description: Temperature critical min value, typically lower than corresponding temp_min values. Unit: millidegree Celsius RW What: /sys/class/hwmon/hwmonX/tempY_lcrit_hyst Description: Temperature hysteresis value for critical min limit. Unit: millidegree Celsius Must be reported as an absolute temperature, NOT a delta from the critical min value. RW What: /sys/class/hwmon/hwmonX/tempY_offset Description: Temperature offset which is added to the temperature reading by the chip. Unit: millidegree Celsius Read/Write value. What: /sys/class/hwmon/hwmonX/tempY_label Description: Suggested temperature channel label. Text string Should only be created if the driver has hints about what this temperature channel is being used for, and user-space doesn't. In all other cases, the label is provided by user-space. RO What: /sys/class/hwmon/hwmonX/tempY_lowest Description: Historical minimum temperature Unit: millidegree Celsius RO What: /sys/class/hwmon/hwmonX/tempY_highest Description: Historical maximum temperature Unit: millidegree Celsius RO What: /sys/class/hwmon/hwmonX/tempY_reset_history Description: Reset temp_lowest and temp_highest WO What: /sys/class/hwmon/hwmonX/temp_reset_history Description: Reset temp_lowest and temp_highest for all sensors WO What: /sys/class/hwmon/hwmonX/tempY_enable Description: Enable or disable the sensors. When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/tempY_rated_min Description: Minimum rated temperature. Unit: millidegree Celsius RO What: /sys/class/hwmon/hwmonX/tempY_rated_max Description: Maximum rated temperature. Unit: millidegree Celsius RO What: /sys/class/hwmon/hwmonX/currY_max Description: Current max value Unit: milliampere RW What: /sys/class/hwmon/hwmonX/currY_min Description: Current min value. Unit: milliampere RW What: /sys/class/hwmon/hwmonX/currY_lcrit Description: Current critical low value Unit: milliampere RW What: /sys/class/hwmon/hwmonX/currY_crit Description: Current critical high value. Unit: milliampere RW What: /sys/class/hwmon/hwmonX/currY_input Description: Current input value Unit: milliampere RO What: /sys/class/hwmon/hwmonX/currY_average Description: Average current use Unit: milliampere RO What: /sys/class/hwmon/hwmonX/currY_lowest Description: Historical minimum current Unit: milliampere RO What: /sys/class/hwmon/hwmonX/currY_highest Description: Historical maximum current Unit: milliampere RO What: /sys/class/hwmon/hwmonX/currY_reset_history Description: Reset currX_lowest and currX_highest WO What: /sys/class/hwmon/hwmonX/curr_reset_history Description: Reset currX_lowest and currX_highest for all sensors WO What: /sys/class/hwmon/hwmonX/currY_enable Description: Enable or disable the sensors. When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/currY_rated_min Description: Minimum rated current. Unit: milliampere RO What: /sys/class/hwmon/hwmonX/currY_rated_max Description: Maximum rated current. Unit: milliampere RO What: /sys/class/hwmon/hwmonX/powerY_average Description: Average power use Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_average_interval Description: Power use averaging interval. A poll notification is sent to this file if the hardware changes the averaging interval. Unit: milliseconds RW What: /sys/class/hwmon/hwmonX/powerY_average_interval_max Description: Maximum power use averaging interval Unit: milliseconds RO What: /sys/class/hwmon/hwmonX/powerY_average_interval_min Description: Minimum power use averaging interval Unit: milliseconds RO What: /sys/class/hwmon/hwmonX/powerY_average_highest Description: Historical average maximum power use Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_average_lowest Description: Historical average minimum power use Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_average_max Description: A poll notification is sent to `powerY_average` when power use rises above this value. Unit: microWatt RW What: /sys/class/hwmon/hwmonX/powerY_average_min Description: A poll notification is sent to `powerY_average` when power use sinks below this value. Unit: microWatt RW What: /sys/class/hwmon/hwmonX/powerY_input Description: Instantaneous power use Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_input_highest Description: Historical maximum power use Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_input_lowest Description: Historical minimum power use Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_reset_history Description: Reset input_highest, input_lowest, average_highest and average_lowest. WO What: /sys/class/hwmon/hwmonX/powerY_accuracy Description: Accuracy of the power meter. Unit: Percent RO What: /sys/class/hwmon/hwmonX/powerY_cap Description: If power use rises above this limit, the system should take action to reduce power use. A poll notification is sent to this file if the cap is changed by the hardware. The `*_cap` files only appear if the cap is known to be enforced by hardware. Unit: microWatt RW What: /sys/class/hwmon/hwmonX/powerY_cap_hyst Description: Margin of hysteresis built around capping and notification. Unit: microWatt RW What: /sys/class/hwmon/hwmonX/powerY_cap_max Description: Maximum cap that can be set. Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_cap_min Description: Minimum cap that can be set. Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_max Description: Maximum power. Unit: microWatt RW What: /sys/class/hwmon/hwmonX/powerY_crit Description: Critical maximum power. If power rises to or above this limit, the system is expected take drastic action to reduce power consumption, such as a system shutdown or a forced powerdown of some devices. Unit: microWatt RW What: /sys/class/hwmon/hwmonX/powerY_enable Description: Enable or disable the sensors. When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/powerY_rated_min Description: Minimum rated power. Unit: microWatt RO What: /sys/class/hwmon/hwmonX/powerY_rated_max Description: Maximum rated power. Unit: microWatt RO What: /sys/class/hwmon/hwmonX/energyY_input Description: Cumulative energy use Unit: microJoule RO What: /sys/class/hwmon/hwmonX/energyY_enable Description: Enable or disable the sensors. When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/humidityY_input Description: Humidity Unit: milli-percent (per cent mille, pcm) RO What: /sys/class/hwmon/hwmonX/humidityY_enable Description: Enable or disable the sensors When disabled the sensor read will return -ENODATA. - 1: Enable - 0: Disable RW What: /sys/class/hwmon/hwmonX/humidityY_rated_min Description: Minimum rated humidity. Unit: milli-percent (per cent mille, pcm) RO What: /sys/class/hwmon/hwmonX/humidityY_rated_max Description: Maximum rated humidity. Unit: milli-percent (per cent mille, pcm) RO What: /sys/class/hwmon/hwmonX/intrusionY_alarm Description: Chassis intrusion detection - 0: OK - 1: intrusion detected RW Contrary to regular alarm flags which clear themselves automatically when read, this one sticks until cleared by the user. This is done by writing 0 to the file. Writing other values is unsupported. What: /sys/class/hwmon/hwmonX/intrusionY_beep Description: Chassis intrusion beep - 0: disable - 1: enable RW What: /sys/class/hwmon/hwmonX/device/pec Description: PEC support on I2C devices - 0, off, n: disable - 1, on, y: enable RW