1What: /sys/class/hwmon/hwmonX/name 2Description: 3 The chip name. 4 This should be a short, lowercase string, not containing 5 whitespace, dashes, or the wildcard character '*'. 6 This attribute represents the chip name. It is the only 7 mandatory attribute. 8 I2C devices get this attribute created automatically. 9 10 RO 11 12What: /sys/class/hwmon/hwmonX/label 13Description: 14 A descriptive label that allows to uniquely identify a 15 device within the system. 16 The contents of the label are free-form. 17 18 RO 19 20What: /sys/class/hwmon/hwmonX/update_interval 21Description: 22 The interval at which the chip will update readings. 23 Unit: millisecond 24 25 RW 26 27 Some devices have a variable update rate or interval. 28 This attribute can be used to change it to the desired value. 29 30What: /sys/class/hwmon/hwmonX/inY_min 31Description: 32 Voltage min value. 33 34 Unit: millivolt 35 36 RW 37 38What: /sys/class/hwmon/hwmonX/inY_lcrit 39Description: 40 Voltage critical min value. 41 42 Unit: millivolt 43 44 RW 45 46 If voltage drops to or below this limit, the system may 47 take drastic action such as power down or reset. At the very 48 least, it should report a fault. 49 50What: /sys/class/hwmon/hwmonX/inY_max 51Description: 52 Voltage max value. 53 54 Unit: millivolt 55 56 RW 57 58What: /sys/class/hwmon/hwmonX/inY_crit 59Description: 60 Voltage critical max value. 61 62 Unit: millivolt 63 64 RW 65 66 If voltage reaches or exceeds this limit, the system may 67 take drastic action such as power down or reset. At the very 68 least, it should report a fault. 69 70What: /sys/class/hwmon/hwmonX/inY_input 71Description: 72 Voltage input value. 73 74 Unit: millivolt 75 76 RO 77 78 Voltage measured on the chip pin. 79 80 Actual voltage depends on the scaling resistors on the 81 motherboard, as recommended in the chip datasheet. 82 83 This varies by chip and by motherboard. 84 Because of this variation, values are generally NOT scaled 85 by the chip driver, and must be done by the application. 86 However, some drivers (notably lm87 and via686a) 87 do scale, because of internal resistors built into a chip. 88 These drivers will output the actual voltage. Rule of 89 thumb: drivers should report the voltage values at the 90 "pins" of the chip. 91 92What: /sys/class/hwmon/hwmonX/inY_average 93Description: 94 Average voltage 95 96 Unit: millivolt 97 98 RO 99 100What: /sys/class/hwmon/hwmonX/inY_lowest 101Description: 102 Historical minimum voltage 103 104 Unit: millivolt 105 106 RO 107 108What: /sys/class/hwmon/hwmonX/inY_highest 109Description: 110 Historical maximum voltage 111 112 Unit: millivolt 113 114 RO 115 116What: /sys/class/hwmon/hwmonX/inY_reset_history 117Description: 118 Reset inX_lowest and inX_highest 119 120 WO 121 122What: /sys/class/hwmon/hwmonX/in_reset_history 123Description: 124 Reset inX_lowest and inX_highest for all sensors 125 126 WO 127 128What: /sys/class/hwmon/hwmonX/inY_label 129Description: 130 Suggested voltage channel label. 131 132 Text string 133 134 Should only be created if the driver has hints about what 135 this voltage channel is being used for, and user-space 136 doesn't. In all other cases, the label is provided by 137 user-space. 138 139 RO 140 141What: /sys/class/hwmon/hwmonX/inY_enable 142Description: 143 Enable or disable the sensors. 144 145 When disabled the sensor read will return -ENODATA. 146 147 - 1: Enable 148 - 0: Disable 149 150 RW 151 152What: /sys/class/hwmon/hwmonX/cpuY_vid 153Description: 154 CPU core reference voltage. 155 156 Unit: millivolt 157 158 RO 159 160 Not always correct. 161 162What: /sys/class/hwmon/hwmonX/vrm 163Description: 164 Voltage Regulator Module version number. 165 166 RW (but changing it should no more be necessary) 167 168 Originally the VRM standard version multiplied by 10, but now 169 an arbitrary number, as not all standards have a version 170 number. 171 172 Affects the way the driver calculates the CPU core reference 173 voltage from the vid pins. 174 175What: /sys/class/hwmon/hwmonX/inY_rated_min 176Description: 177 Minimum rated voltage. 178 179 Unit: millivolt 180 181 RO 182 183What: /sys/class/hwmon/hwmonX/inY_rated_max 184Description: 185 Maximum rated voltage. 186 187 Unit: millivolt 188 189 RO 190 191What: /sys/class/hwmon/hwmonX/fanY_min 192Description: 193 Fan minimum value 194 195 Unit: revolution/min (RPM) 196 197 RW 198 199What: /sys/class/hwmon/hwmonX/fanY_max 200Description: 201 Fan maximum value 202 203 Unit: revolution/min (RPM) 204 205 Only rarely supported by the hardware. 206 RW 207 208What: /sys/class/hwmon/hwmonX/fanY_input 209Description: 210 Fan input value. 211 212 Unit: revolution/min (RPM) 213 214 RO 215 216What: /sys/class/hwmon/hwmonX/fanY_div 217Description: 218 Fan divisor. 219 220 Integer value in powers of two (1, 2, 4, 8, 16, 32, 64, 128). 221 222 RW 223 224 Some chips only support values 1, 2, 4 and 8. 225 Note that this is actually an internal clock divisor, which 226 affects the measurable speed range, not the read value. 227 228What: /sys/class/hwmon/hwmonX/fanY_pulses 229Description: 230 Number of tachometer pulses per fan revolution. 231 232 Integer value, typically between 1 and 4. 233 234 RW 235 236 This value is a characteristic of the fan connected to the 237 device's input, so it has to be set in accordance with the fan 238 model. 239 240 Should only be created if the chip has a register to configure 241 the number of pulses. In the absence of such a register (and 242 thus attribute) the value assumed by all devices is 2 pulses 243 per fan revolution. 244 245What: /sys/class/hwmon/hwmonX/fanY_target 246Description: 247 Desired fan speed 248 249 Unit: revolution/min (RPM) 250 251 RW 252 253 Only makes sense if the chip supports closed-loop fan speed 254 control based on the measured fan speed. 255 256What: /sys/class/hwmon/hwmonX/fanY_label 257Description: 258 Suggested fan channel label. 259 260 Text string 261 262 Should only be created if the driver has hints about what 263 this fan channel is being used for, and user-space doesn't. 264 In all other cases, the label is provided by user-space. 265 266 RO 267 268What: /sys/class/hwmon/hwmonX/fanY_enable 269Description: 270 Enable or disable the sensors. 271 272 When disabled the sensor read will return -ENODATA. 273 274 - 1: Enable 275 - 0: Disable 276 277 RW 278 279What: /sys/class/hwmon/hwmonX/pwmY 280Description: 281 Pulse width modulation fan control. 282 283 Integer value in the range 0 to 255 284 285 RW 286 287 255 is max or 100%. 288 289What: /sys/class/hwmon/hwmonX/pwmY_enable 290Description: 291 Fan speed control method: 292 293 - 0: no fan speed control (i.e. fan at full speed) 294 - 1: manual fan speed control enabled (using `pwmY`) 295 - 2+: automatic fan speed control enabled 296 297 Check individual chip documentation files for automatic mode 298 details. 299 300 RW 301 302What: /sys/class/hwmon/hwmonX/pwmY_mode 303Description: 304 - 0: DC mode (direct current) 305 - 1: PWM mode (pulse-width modulation) 306 307 RW 308 309What: /sys/class/hwmon/hwmonX/pwmY_freq 310Description: 311 Base PWM frequency in Hz. 312 313 Only possibly available when pwmN_mode is PWM, but not always 314 present even then. 315 316 RW 317 318What: /sys/class/hwmon/hwmonX/pwmY_auto_channels_temp 319Description: 320 Select which temperature channels affect this PWM output in 321 auto mode. 322 323 Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc... 324 Which values are possible depend on the chip used. 325 326 RW 327 328What: /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_pwm 329What: /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp 330What: /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp_hyst 331Description: 332 Define the PWM vs temperature curve. 333 334 Number of trip points is chip-dependent. Use this for chips 335 which associate trip points to PWM output channels. 336 337 RW 338 339What: /sys/class/hwmon/hwmonX/tempY_auto_pointZ_pwm 340What: /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp 341What: /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp_hyst 342Description: 343 Define the PWM vs temperature curve. 344 345 Number of trip points is chip-dependent. Use this for chips 346 which associate trip points to temperature channels. 347 348 RW 349 350What: /sys/class/hwmon/hwmonX/tempY_type 351Description: 352 Sensor type selection. 353 354 Integers 1 to 6 355 356 RW 357 358 - 1: CPU embedded diode 359 - 2: 3904 transistor 360 - 3: thermal diode 361 - 4: thermistor 362 - 5: AMD AMDSI 363 - 6: Intel PECI 364 365 Not all types are supported by all chips 366 367What: /sys/class/hwmon/hwmonX/tempY_max 368Description: 369 Temperature max value. 370 371 Unit: millidegree Celsius (or millivolt, see below) 372 373 RW 374 375What: /sys/class/hwmon/hwmonX/tempY_min 376Description: 377 Temperature min value. 378 379 Unit: millidegree Celsius 380 381 RW 382 383What: /sys/class/hwmon/hwmonX/tempY_max_hyst 384Description: 385 Temperature hysteresis value for max limit. 386 387 Unit: millidegree Celsius 388 389 Must be reported as an absolute temperature, NOT a delta 390 from the max value. 391 392 RW 393 394What: /sys/class/hwmon/hwmonX/tempY_min_hyst 395Description: 396 Temperature hysteresis value for min limit. 397 Unit: millidegree Celsius 398 399 Must be reported as an absolute temperature, NOT a delta 400 from the min value. 401 402 RW 403 404What: /sys/class/hwmon/hwmonX/tempY_input 405Description: 406 Temperature input value. 407 408 Unit: millidegree Celsius 409 410 RO 411 412What: /sys/class/hwmon/hwmonX/tempY_crit 413Description: 414 Temperature critical max value, typically greater than 415 corresponding temp_max values. 416 417 Unit: millidegree Celsius 418 419 RW 420 421What: /sys/class/hwmon/hwmonX/tempY_crit_alarm 422Description: 423 Critical high temperature alarm flag. 424 425 - 0: OK 426 - 1: temperature has reached tempY_crit 427 428 RW 429 430 Contrary to regular alarm flags which clear themselves 431 automatically when read, this one sticks until cleared by 432 the user. This is done by writing 0 to the file. Writing 433 other values is unsupported. 434 435What: /sys/class/hwmon/hwmonX/tempY_crit_hyst 436Description: 437 Temperature hysteresis value for critical limit. 438 439 Unit: millidegree Celsius 440 441 Must be reported as an absolute temperature, NOT a delta 442 from the critical value. 443 444 RW 445 446What: /sys/class/hwmon/hwmonX/tempY_emergency 447Description: 448 Temperature emergency max value, for chips supporting more than 449 two upper temperature limits. Must be equal or greater than 450 corresponding temp_crit values. 451 452 Unit: millidegree Celsius 453 454 RW 455 456What: /sys/class/hwmon/hwmonX/tempY_emergency_hyst 457Description: 458 Temperature hysteresis value for emergency limit. 459 460 Unit: millidegree Celsius 461 462 Must be reported as an absolute temperature, NOT a delta 463 from the emergency value. 464 465 RW 466 467What: /sys/class/hwmon/hwmonX/tempY_lcrit 468Description: 469 Temperature critical min value, typically lower than 470 corresponding temp_min values. 471 472 Unit: millidegree Celsius 473 474 RW 475 476What: /sys/class/hwmon/hwmonX/tempY_lcrit_hyst 477Description: 478 Temperature hysteresis value for critical min limit. 479 480 Unit: millidegree Celsius 481 482 Must be reported as an absolute temperature, NOT a delta 483 from the critical min value. 484 485 RW 486 487What: /sys/class/hwmon/hwmonX/tempY_offset 488Description: 489 Temperature offset which is added to the temperature reading 490 by the chip. 491 492 Unit: millidegree Celsius 493 494 Read/Write value. 495 496What: /sys/class/hwmon/hwmonX/tempY_label 497Description: 498 Suggested temperature channel label. 499 500 Text string 501 502 Should only be created if the driver has hints about what 503 this temperature channel is being used for, and user-space 504 doesn't. In all other cases, the label is provided by 505 user-space. 506 507 RO 508 509What: /sys/class/hwmon/hwmonX/tempY_lowest 510Description: 511 Historical minimum temperature 512 513 Unit: millidegree Celsius 514 515 RO 516 517What: /sys/class/hwmon/hwmonX/tempY_highest 518Description: 519 Historical maximum temperature 520 521 Unit: millidegree Celsius 522 523 RO 524 525What: /sys/class/hwmon/hwmonX/tempY_reset_history 526Description: 527 Reset temp_lowest and temp_highest 528 529 WO 530 531What: /sys/class/hwmon/hwmonX/temp_reset_history 532Description: 533 Reset temp_lowest and temp_highest for all sensors 534 535 WO 536 537What: /sys/class/hwmon/hwmonX/tempY_enable 538Description: 539 Enable or disable the sensors. 540 541 When disabled the sensor read will return -ENODATA. 542 543 - 1: Enable 544 - 0: Disable 545 546 RW 547 548What: /sys/class/hwmon/hwmonX/tempY_rated_min 549Description: 550 Minimum rated temperature. 551 552 Unit: millidegree Celsius 553 554 RO 555 556What: /sys/class/hwmon/hwmonX/tempY_rated_max 557Description: 558 Maximum rated temperature. 559 560 Unit: millidegree Celsius 561 562 RO 563 564What: /sys/class/hwmon/hwmonX/currY_max 565Description: 566 Current max value 567 568 Unit: milliampere 569 570 RW 571 572What: /sys/class/hwmon/hwmonX/currY_min 573Description: 574 Current min value. 575 576 Unit: milliampere 577 578 RW 579 580What: /sys/class/hwmon/hwmonX/currY_lcrit 581Description: 582 Current critical low value 583 584 Unit: milliampere 585 586 RW 587 588What: /sys/class/hwmon/hwmonX/currY_crit 589Description: 590 Current critical high value. 591 592 Unit: milliampere 593 594 RW 595 596What: /sys/class/hwmon/hwmonX/currY_input 597Description: 598 Current input value 599 600 Unit: milliampere 601 602 RO 603 604What: /sys/class/hwmon/hwmonX/currY_average 605Description: 606 Average current use 607 608 Unit: milliampere 609 610 RO 611 612What: /sys/class/hwmon/hwmonX/currY_lowest 613Description: 614 Historical minimum current 615 616 Unit: milliampere 617 618 RO 619 620What: /sys/class/hwmon/hwmonX/currY_highest 621Description: 622 Historical maximum current 623 Unit: milliampere 624 RO 625 626What: /sys/class/hwmon/hwmonX/currY_reset_history 627Description: 628 Reset currX_lowest and currX_highest 629 630 WO 631 632What: /sys/class/hwmon/hwmonX/curr_reset_history 633Description: 634 Reset currX_lowest and currX_highest for all sensors 635 636 WO 637 638What: /sys/class/hwmon/hwmonX/currY_enable 639Description: 640 Enable or disable the sensors. 641 642 When disabled the sensor read will return -ENODATA. 643 644 - 1: Enable 645 - 0: Disable 646 647 RW 648 649What: /sys/class/hwmon/hwmonX/currY_rated_min 650Description: 651 Minimum rated current. 652 653 Unit: milliampere 654 655 RO 656 657What: /sys/class/hwmon/hwmonX/currY_rated_max 658Description: 659 Maximum rated current. 660 661 Unit: milliampere 662 663 RO 664 665What: /sys/class/hwmon/hwmonX/powerY_average 666Description: 667 Average power use 668 669 Unit: microWatt 670 671 RO 672 673What: /sys/class/hwmon/hwmonX/powerY_average_interval 674Description: 675 Power use averaging interval. A poll 676 notification is sent to this file if the 677 hardware changes the averaging interval. 678 679 Unit: milliseconds 680 681 RW 682 683What: /sys/class/hwmon/hwmonX/powerY_average_interval_max 684Description: 685 Maximum power use averaging interval 686 687 Unit: milliseconds 688 689 RO 690 691What: /sys/class/hwmon/hwmonX/powerY_average_interval_min 692Description: 693 Minimum power use averaging interval 694 695 Unit: milliseconds 696 697 RO 698 699What: /sys/class/hwmon/hwmonX/powerY_average_highest 700Description: 701 Historical average maximum power use 702 703 Unit: microWatt 704 705 RO 706 707What: /sys/class/hwmon/hwmonX/powerY_average_lowest 708Description: 709 Historical average minimum power use 710 711 Unit: microWatt 712 713 RO 714 715What: /sys/class/hwmon/hwmonX/powerY_average_max 716Description: 717 A poll notification is sent to 718 `powerY_average` when power use 719 rises above this value. 720 721 Unit: microWatt 722 723 RW 724 725What: /sys/class/hwmon/hwmonX/powerY_average_min 726Description: 727 A poll notification is sent to 728 `powerY_average` when power use 729 sinks below this value. 730 731 Unit: microWatt 732 733 RW 734 735What: /sys/class/hwmon/hwmonX/powerY_input 736Description: 737 Instantaneous power use 738 739 Unit: microWatt 740 741 RO 742 743What: /sys/class/hwmon/hwmonX/powerY_input_highest 744Description: 745 Historical maximum power use 746 747 Unit: microWatt 748 749 RO 750 751What: /sys/class/hwmon/hwmonX/powerY_input_lowest 752Description: 753 Historical minimum power use 754 755 Unit: microWatt 756 757 RO 758 759What: /sys/class/hwmon/hwmonX/powerY_reset_history 760Description: 761 Reset input_highest, input_lowest, 762 average_highest and average_lowest. 763 764 WO 765 766What: /sys/class/hwmon/hwmonX/powerY_accuracy 767Description: 768 Accuracy of the power meter. 769 770 Unit: Percent 771 772 RO 773 774What: /sys/class/hwmon/hwmonX/powerY_cap 775Description: 776 If power use rises above this limit, the 777 system should take action to reduce power use. 778 A poll notification is sent to this file if the 779 cap is changed by the hardware. The `*_cap` 780 files only appear if the cap is known to be 781 enforced by hardware. 782 783 Unit: microWatt 784 785 RW 786 787What: /sys/class/hwmon/hwmonX/powerY_cap_hyst 788Description: 789 Margin of hysteresis built around capping and 790 notification. 791 792 Unit: microWatt 793 794 RW 795 796What: /sys/class/hwmon/hwmonX/powerY_cap_max 797Description: 798 Maximum cap that can be set. 799 800 Unit: microWatt 801 802 RO 803 804What: /sys/class/hwmon/hwmonX/powerY_cap_min 805Description: 806 Minimum cap that can be set. 807 808 Unit: microWatt 809 810 RO 811 812What: /sys/class/hwmon/hwmonX/powerY_max 813Description: 814 Maximum power. 815 816 Unit: microWatt 817 818 RW 819 820What: /sys/class/hwmon/hwmonX/powerY_crit 821Description: 822 Critical maximum power. 823 824 If power rises to or above this limit, the 825 system is expected take drastic action to reduce 826 power consumption, such as a system shutdown or 827 a forced powerdown of some devices. 828 829 Unit: microWatt 830 831 RW 832 833What: /sys/class/hwmon/hwmonX/powerY_enable 834Description: 835 Enable or disable the sensors. 836 837 When disabled the sensor read will return 838 -ENODATA. 839 840 - 1: Enable 841 - 0: Disable 842 843 RW 844 845What: /sys/class/hwmon/hwmonX/powerY_rated_min 846Description: 847 Minimum rated power. 848 849 Unit: microWatt 850 851 RO 852 853What: /sys/class/hwmon/hwmonX/powerY_rated_max 854Description: 855 Maximum rated power. 856 857 Unit: microWatt 858 859 RO 860 861What: /sys/class/hwmon/hwmonX/energyY_input 862Description: 863 Cumulative energy use 864 865 Unit: microJoule 866 867 RO 868 869What: /sys/class/hwmon/hwmonX/energyY_enable 870Description: 871 Enable or disable the sensors. 872 873 When disabled the sensor read will return 874 -ENODATA. 875 876 - 1: Enable 877 - 0: Disable 878 879 RW 880 881What: /sys/class/hwmon/hwmonX/humidityY_input 882Description: 883 Humidity 884 885 Unit: milli-percent (per cent mille, pcm) 886 887 RO 888 889 890What: /sys/class/hwmon/hwmonX/humidityY_enable 891Description: 892 Enable or disable the sensors 893 894 When disabled the sensor read will return 895 -ENODATA. 896 897 - 1: Enable 898 - 0: Disable 899 900 RW 901 902What: /sys/class/hwmon/hwmonX/humidityY_rated_min 903Description: 904 Minimum rated humidity. 905 906 Unit: milli-percent (per cent mille, pcm) 907 908 RO 909 910What: /sys/class/hwmon/hwmonX/humidityY_rated_max 911Description: 912 Maximum rated humidity. 913 914 Unit: milli-percent (per cent mille, pcm) 915 916 RO 917 918 919What: /sys/class/hwmon/hwmonX/intrusionY_alarm 920Description: 921 Chassis intrusion detection 922 923 - 0: OK 924 - 1: intrusion detected 925 926 RW 927 928 Contrary to regular alarm flags which clear themselves 929 automatically when read, this one sticks until cleared by 930 the user. This is done by writing 0 to the file. Writing 931 other values is unsupported. 932 933What: /sys/class/hwmon/hwmonX/intrusionY_beep 934Description: 935 Chassis intrusion beep 936 937 - 0: disable 938 - 1: enable 939 940 RW 941