Lines Matching refs:fan
46 - Fan control and monitoring: fan speed, fan enable/disable
121 Sysfs device attributes for the sensors and fan are on the
918 Use it to determine the register holding the fan
921 - make sure the fan is running
924 Often fan and temperature values vary between
1132 Fan control and monitoring: fan speed, fan enable/disable
1135 procfs: /proc/acpi/ibm/fan
1140 NOTE NOTE NOTE: fan control operations are disabled by default for
1144 This feature attempts to show the current fan speed, control mode and
1145 other fan data that might be available. The speed is read directly
1150 Some Lenovo ThinkPads support a secondary fan. This fan cannot be
1151 controlled separately, it shares the main fan control.
1156 stops the fan. The higher the level, the higher the fan speed, although
1157 adjacent levels often map to the same fan speed. 7 is the highest
1158 level, where the fan reaches the maximum recommended speed.
1160 Level "auto" means the EC changes the fan level according to some
1164 In this level, the EC disables the speed-locked closed-loop fan control,
1165 and drives the fan as fast as it can go, which might exceed hardware
1168 The fan usually ramps up or down slowly from one speed to another, and
1169 it is normal for the EC to take several seconds to react to fan
1174 WARNING WARNING WARNING: do not leave the fan disabled unless you are
1178 An enabled fan in level "auto" may stop spinning if the EC decides the
1180 normal, and the EC will spin the fan up if the various thermal readings
1184 Specifically, the fan is turned on when either the CPU temperature
1186 fan is turned off when the CPU temperature drops to 49 degrees and the
1190 The ThinkPad's ACPI DSDT code will reprogram the fan on its own when
1191 certain conditions are met. It will override any fan programming done
1194 The thinkpad-acpi kernel driver can be programmed to revert the fan
1196 fan commands: "enable", "disable", "level" or "watchdog", or if there
1199 120 seconds. This functionality is called fan safety watchdog.
1201 Note that the watchdog timer stops after it enables the fan. It will be
1203 above mentioned fan commands is received. The fan watchdog is,
1204 therefore, not suitable to protect against fan mode changes made through
1205 means other than the "enable", "disable", and "level" procfs fan
1206 commands, or the hwmon fan control sysfs interface.
1210 The fan may be enabled or disabled with the following commands:
1212 echo enable >/proc/acpi/ibm/fan
1213 echo disable >/proc/acpi/ibm/fan
1215 Placing a fan on level 0 is the same as disabling it. Enabling a fan
1218 The fan level can be controlled with the command:
1220 echo 'level <level>' > /proc/acpi/ibm/fan
1228 On the X31 and X40 (and ONLY on those models), the fan speed can be
1229 controlled to a certain degree. Once the fan is running, it can be
1232 echo 'speed <speed>' > /proc/acpi/ibm/fan
1234 The sustainable range of fan speeds on the X40 appears to be from about
1236 effect or the fan speed eventually settles somewhere in that range. The
1237 fan cannot be stopped or started with this command. This functionality
1242 echo 'watchdog <interval in seconds>' > /proc/acpi/ibm/fan
1249 part, and the exception is the fan safety watchdog.
1260 0: PWM offline (fan is set to full-speed mode)
1261 1: Manual PWM control (use pwm1 to set fan level)
1271 scale of 0-255. 0 means fan stopped, 255 means highest normal
1274 This attribute only commands the fan if pmw1_enable is set to 1
1284 Fan tachometer reading, in RPM, for the secondary fan.
1285 Available only on some ThinkPads. If the secondary fan is
1292 To stop the fan: set pwm1 to zero, and pwm1_enable to 1.
1294 To start the fan in a safe mode: set pwm1_enable to 2. If that fails