diff options
Diffstat (limited to 'Documentation/hwmon/pc87427')
| -rw-r--r-- | Documentation/hwmon/pc87427 | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427 index db5cc1227a83..3282bf39d67d 100644 --- a/Documentation/hwmon/pc87427 +++ b/Documentation/hwmon/pc87427 @@ -20,8 +20,8 @@ The National Semiconductor Super I/O chip includes complete hardware monitoring capabilities. It can monitor up to 18 voltages, 8 fans and 6 temperature sensors. Only the fans are supported at the moment. -This chip also has fan controlling features, which are not yet supported -by this driver either. +This chip also has fan controlling features (up to 4 PWM outputs), +which are partly supported by this driver. The driver assumes that no more than one chip is present, which seems reasonable. @@ -36,3 +36,12 @@ signal. Speeds down to 83 RPM can be measured. An alarm is triggered if the rotation speed drops below a programmable limit. Another alarm is triggered if the speed is too low to be measured (including stalled or missing fan). + + +Fan Speed Control +----------------- + +Fan speed can be controlled by PWM outputs. There are 4 possible modes: +always off, always on, manual and automatic. The latter isn't supported +by the driver: you can only return to that mode if it was the original +setting, and the configuration interface is missing. |