Controller having a control part which is configured for controlling an electrically adjustable piece of furniture, and a switched-mode power supply which supplies the control part and is integrated in a common housing of the controller; - wherein the switched-mode power supply has a first and a second stage (21, 22), wherein the first stage is configured to generate an intermediate voltage from a mains voltage applied to the switched-mode power supply on the input side, and wherein the second stage is configured to use a switching regulator module in switched operation to generate from the intermediate voltage a DC voltage which is supplied to the control part for generating at least one output voltage of the controller; - wherein the switched-mode power supply is configured to be switched to an idle operating state depending on a standby signal; characterized in that - the switched-mode power supply is configured to provide a supply voltage for the switching regulator module in the idle mode by a start-up circuit that comprises an energy store and a resistive element in a clocked mode of the switching regulator module and to provide it permanently in a normal mode by an operating supply circuit; - the energy store and the resistive element are coupled to output terminals of the first stage at which the intermediate voltage is provided; - the energy store is charged in the idle state via a current resulting from the intermediate voltage and a resistance of the resistive element; - the clocked operation results from periodically charging and discharging the energy store; - the start-up circuit periodically initializes the switching regulator module and switches it off again in the clocked mode in the idle mode, so that a rapid transition to the normal mode is made possible; and - the energy store and the resistance element are dimensioned such that, in the idle mode, a period of time for charging the energy store is greater than a period of time for discharging the energy store by the switching regulator module. - wherein the switched-mode power supply has a first and a second stage (21, 22), wherein the first stage is configured to generate an intermediate voltage from a mains voltage applied to the switched-mode power supply on the input side, and wherein the second stage is configured to use a switching regulator module in switched operation to generate from the intermediate voltage a DC voltage which is supplied to the control part for generating at least one output voltage of the controller; - wherein the switched-mode power supply is configured to be switched to an idle operating state depending on a standby signal; - the switched-mode power supply is configured to provide a supply voltage for the switching regulator module in the idle mode by a start-up circuit that comprises an energy store and a resistive element in a clocked mode of the switching regulator module and to provide it permanently in a normal mode by an operating supply circuit; - the energy store and the resistive element are coupled to output terminals of the first stage at which the intermediate voltage is provided; - the energy store is charged in the idle state via a current resulting from the intermediate voltage and a resistance of the resistive element; - the clocked operation results from periodically charging and discharging the energy store; - the start-up circuit periodically initializes the switching regulator module and switches it off again in the clocked mode in the idle mode, so that a rapid transition to the normal mode is made possible; and - the energy store and the resistance element are dimensioned such that, in the idle mode, a period of time for charging the energy store is greater than a period of time for discharging the energy store by the switching regulator module.