On mobile computers, if there is no "ACPI Wake Alarm" device detected, Windows 8 disables "allow wake timers" on all in-box power plans, and Allow scheduled maintenance to wake up my computer at the scheduled time is not enabled.
After initial installation of Window 8, Windows Update is preconfigured to initiate the regular maintenance task and wake event to ensure that it is run. Windows 8 automatically configures a "Regular Maintenance" event in TaskScheduler to run at 3:00 AM every day. If the desktop machine does not have an "ACPI Wake Alarm" device (or if it is disabled in the BIOS), Windows 8 still uses the Real Time Clock (RTC) to program wake events, assuming the power policy/Advanced settings/Sleep/Allow wake timers is Enabled for AC power. Also, the power policy/Advanced settings/Sleep/Allow wake timers will default to Enabled for AC power. Causeįor Windows 8 desktops or All-in-one computers, under Action Center > Automatic Maintenance, the Allow scheduled maintenance to wake up my computer at the scheduled time checkbox is automatically enabled. This article provides a solution to an issue where desktop wakes up unexpectedly from sleep or hibernation.Īpplies to: Windows 8 Original KB number: 2799178 SymptomsĪ Windows 8 Desktop computer is automatically waking from sleep or hibernation at a certain time even if there is no "ACPI Wake Alarm" system device found by the operating system. Desktop wakes up unexpectedly from sleep or hibernation
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