- Breezed scans the temperatures every 5s and sets the fan speed
- according to a series of thresholds.
-
- Unfortunately, if the fan speed is set directly according to these
- temperature thresholds, it creates oscillations: The fan goes up,
- temperature goes down, hence fan goes down, temperature goes up,
- etc.
-
- To mitigate such phenomenons, the daemon waits at least 30s after
- the last change before reducing the fan speed, and the actual
- thresholds to decrease the fan speed are two degrees below the
- provided thresholds, which are used when increasing the fan
- speed. This creates a stability area of two degrees, which seems to
- be enough. Please let me know if you have problem with the
- resulting overall behavior.
-
- * ARGUMENTS
-
- The breezed executable can read a configuration file (which is
- /etc/breezed.conf by default, but that you can specify with
- --configuration-file <file>) or get the various parameters on the
- command line.
-
- The thermal files can be specified either with the --thermal-files
- options on the command line or the thermal_files keyword in the
- configuration file. The provided value should be a comma-separated
- list of filenames. When it want to pool the temperature, the daemon
- will read those files and compute the maximum integer value they
- contains.
-
- The fan file can be specified with either --fan-file or the
- fan_file keyword. The specified file will be used by the daemon to
- control the fan speed by writing "level n" into it.
-
- The temperature thresholds can be specified either with the
- --temperature-thresholds argument, or with the
- temperature_thresholds keyword in the configuration file. The
- provided value should be a comma separated list of integers. The
- first one is actually ignored and forced to -1. Each value states
- which temperature should trigger the given level.
-
- For instance, my X61s has 8 fan levels, from 0 to 7. The thresholds
- I picked are -1,52,54,56,58,60,62,64. Hence, when the temperature
- reaches 52C, the fan is set to level 1, when it reached 54C it is
- set to level 2, etc. The maximum speed level 7 is chosen for any
- temperature equal or greater than 64C. As said above, the
- temperature to decrease the speed has to be two degrees below the
- provided thresholds. Hence, the temperature of my X61s has to go
- down to 50C (52C - 2) for the fan to switch off. Also, the daemon
- waits at least 30s before reducing the speed of the fan.