| One of the significant features Microsoft introduced in | | | | that "off" worked effectively with this new model, |
| Vista is new power saving mode. Windows XP has | | | | instead of waiting for green signal from each |
| two power saving mode, Standby and Hibernate. | | | | application in the computer, Windows Vista sending |
| Windows Vista replaced them by Sleep mode. | | | | notice to each application, services and devices about |
| Hibernate is still available as an advanced power | | | | the power saving state and wait for maximum 2 |
| setting, but the Sleep mode is the default one and has | | | | seconds for them to finish up their current job and put |
| more advanced features. | | | | themselves into a state from where they can continue |
| While in sleep, computer uses very less power for | | | | when the system wakes up. Similarly Windows vista is |
| internal use. In notebooks, with the minimum power | | | | very fast to come back from the sleep state. When |
| used during sleep mode, system goes to stand by | | | | you open the lid of your laptop, you will find your |
| mode and the state of the system is saved in the | | | | system becomes instantly on, sometime you may |
| memory. If battery power goes down to critically low | | | | wonder if it was on whole time. |
| level, the system wakes for a very short time to save | | | | Another goal is to reduce the power consumption |
| the needed information onto the hard drive, and | | | | when the system is idle. Normally we want to avoid |
| immediately goes to hibernate state. | | | | long boot process of the computer, so we prefer to |
| In Desktop systems, the process is little different. Here | | | | keep the system up 24X7. This may be nice to keep |
| Microsoft Vista uses "hybrid sleep". In hybrid sleep, the | | | | your system always ready to work but in this way we |
| state of the system is stored both in RAM and on disk, | | | | are wasting huge amount of power. Windows Vista's |
| so that system can recover it's state in case the | | | | sleep mode made dramatic change to reduce |
| power is lost. After saving the state of the system, it | | | | computer's idle power consumption. While a typical |
| goes to sleep mode from where computer can easily | | | | Pentium 4 system uses 102.6 watts of power, same |
| bring back to working state. Top goal of introducing this | | | | PC while in sleep consumes only 5.6 watts. Vista |
| mode is enabling easy and first 'on' and 'off' of the | | | | provides API for the application developers so that |
| computer. While making sure computer can save all | | | | application can get notifications about the power |
| data when the system is turned off, and brings in | | | | scheme being used on the system and then adapt |
| same state while you turn back on. In order to ensure | | | | their behavior for the power scheme. |