| tate | Description |
| S0/Working | System is on. The CPU is fully up and running; power conservation is on a per-device basis. |
| S1 Sleep | System appears off. The CPU is stopped; RAM is refreshed; the system is running in a low power mode. |
| S2 Sleep | System appears off. The CPU has no power; RAM is refreshed; the system is in a lower power mode than S1. |
| S3 Sleep (Standby) | System appears off. The CPU has no power; RAM is in slow refresh; the power supply is in a reduced power mode. This mode is also referred to as 'Save To RAM'. |
| S4 Hibernate | System appears off. The hardware is completely off, but system memory has been saved as a temporary file onto the harddisk. This mode is also referred to as 'Save To Disk'. |
| S5/Off | System is off. The hardware is completely off, the operating system has shut down; nothing has been saved. Requires a complete reboot to return to the Working state. |