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| author | Chris Packham <chris.packham@alliedtelesis.co.nz> | 2017-05-15 13:30:27 +1200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2017-06-11 17:08:19 -0700 |
| commit | 1d58f5efbf2d8599a9062e4c800a072e2f015625 (patch) | |
| tree | fff4e3b1eb18e6ccf32d0cb07c62d6c6bb356967 /Documentation/hwmon | |
| parent | e4651640403307d79559dff113da4933c0921714 (diff) | |
| download | linux-1d58f5efbf2d8599a9062e4c800a072e2f015625.tar.bz2 | |
hwmon: (adt7475) fan stall prevention
By default adt7475 will stop the fans (pwm duty cycle 0%) when the
temperature drops past Tmin - hysteresis. Some systems want to keep the
fans moving even when the temperature drops so add new sysfs attributes
that configure the enhanced acoustics min 1-3 which allows the fans to
run at the minimum configure pwm duty cycle.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/adt7475 | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475 index 0502f2b464e1..dc0b55794c47 100644 --- a/Documentation/hwmon/adt7475 +++ b/Documentation/hwmon/adt7475 @@ -109,6 +109,11 @@ fan speed) is applied. PWM values range from 0 (off) to 255 (full speed). Fan speed may be set to maximum when the temperature sensor associated with the PWM control exceeds temp#_max. +At Tmin - hysteresis the PWM output can either be off (0% duty cycle) or at the +minimum (i.e. auto_point1_pwm). This behaviour can be configured using the +pwm[1-*]_stall_disable sysfs attribute. A value of 0 means the fans will shut +off. A value of 1 means the fans will run at auto_point1_pwm. + Notes ----- |