docs/designs/thermal-control-modes.md

1 # Control.ThermalMode dbus interface with Supported and Current properties
7 Created: 2019-02-06
16 themselves, where no current mechanism exists to detect the presence of the
17 optical cables plugged into a card downwind from the GPUs' exhaust, an end-user
35 <https://github.com/openbmc/dbus-sensors/blob/master/src/ExitAirTempSensor.cpp>
39 Create the ability for an end-user to enable the use of a thermal control mode
40 other than the default. In this use-case, the mode is specific to an
42 standardized profile/modes such "Acoustic" and "Performance". Once the end-user
43 selects a documented mode for the platform, the thermal control application
44 alters its control algorithm according to the defined mode, which is
50 available thermal control modes along with what current mode is in use.
51 Initially the current mode would be set to "Default" and the implementation of
54 As one implementation, phosphor-fan-presence/control would be updated to extend
58 queried for supported modes or update the current mode. An end-user may set the
59 current mode to any of those supported modes and the current mode would be
61 application zone objects are started, the last set control mode is used.
75 associated control changes when a mode is set.
80 mode selected on a witherspoon system.