#Win10 sleep vs hibernate drivers
#Win10 sleep vs hibernate driver

#Win10 sleep vs hibernate driver

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.

#Win10 sleep vs hibernate drivers

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).There are three startup modes in Windows: