![]() ![]() The TargetSystemState bit field specifies the last system power state transition for which the driver received a system power IRP before the computer shut down or entered hibernation. However, if TargetSystemState = PowerSystemShutdown and EffectiveSystemState = PowerSystemHibernate, a fast startup occurred. If TargetSystemState = PowerSystemHibernate and EffectiveSystemState = PowerSystemHibernate, a wake-from-hibernation occurred. The TargetSystemState and EffectiveSystemState bit fields are set to SYSTEM_POWER_STATE enumeration values. However, this structure contains two bit fields, TargetSystemState and EffectiveSystemState, that can be read by drivers to determine whether a fast startup or a wake-from-hibernation occurred. Most of the bit fields in the SYSTEM_POWER_STATE_CONTEXT structure are reserved for system use and are opaque to drivers. This information is encoded in bit fields in the SYSTEM_POWER_STATE_CONTEXT structure. Starting with Windows Vista, the Power member structure contains a SystemPowerStateContext member, which is a SYSTEM_POWER_STATE_CONTEXT structure that contains information about the previous system power states. The driver's I/O stack location in this IRP contains a Power member, which is a structure that contains power-related information. To distinguish a fast startup from a wake-from-hibernation, a driver can inspect the information in the system set-power ( IRP_MN_SET_POWER) IRP that informs the driver that the computer has entered the S0 (working) state. A fast startup tends to take significantly less time than a cold startup. In contrast, a fast startup simply loads the hibernation file (Hiberfil.sys) into memory. Next, the kernel configures core system functions, enumerates the devices attached to the computer, and loads drivers for them. ![]() To distinguish fast startups from wake-from-hibernation, kernel-mode device drivers can examine system power IRPs.ĭuring a cold startup, the boot loader constructs a kernel memory image by loading the sections of the Windows kernel file into memory and linking them. Fast (combines first two, introduced in Windows 8).See Terms of Use for other considerations.There are three startup modes in Windows: As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. The information contained herein is provided as-is in response to emerging issues. Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. If this guide does not result in the desired effect, see also the other contributions of this series.įor more useful information, see the following articles in the Microsoft Knowledge Base:Ģ642510 PC automatically wakes up from sleep mode (I)Ģ642546 PC automatically wakes up from sleep to (III) Note: The automatic wake up could also be caused by other reasons. If you are using a mobile PC, enable for both areas On battery and Network operation. Now change the preference under Allow timer for activation from Enable in Disable. Click on the plus sign in Allow timer for activation.Ĩ. Under Power options click on the plus sign in Energy saving.ħ. In the following dialog box, click on Change advanced power settings.Ħ. In the current power plan, click the entry Change power saving options.ĥ. In the result list of the start menu, click on Power options.Ĥ. In the field for Search programs and files enter the command Power options.ģ. These include, for example, scheduled backups. May be the PC is activated by timed action of the system or an application. If, however, the computer wakes up unexpectedly regularly at night (or even during the day) at certain times, you should check the power saving modes. When I put my PC into sleep mode, it automatically wakes up at certain times. ![]()
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