In one example in accordance with the present disclosure, a computing device is provided. The computing device includes an interface module and a power management module. The interface module is to provide a user interface that facilitates enabling and disabling of an always on feature, and further facilitates configuration of a permissible advanced configuration and power interface (ACPI) S3 state period. The power management module to receive a request to enter an ACPI S3 state, determine whether the always on feature is enabled, and in response to determining that the always on feature is enabled, determine whether the computing device is within a user-defined permissible ACPI S3 state period. In response to determining that the computing device is within the user-defined permissible ACPI S3 state period, the power management module is to set a wake event and cause the computing device to enter the ACPI S3 state.