Windows 8 and 8.1 Forums


Windows 8 Automatic Maintainence Question

  1. #1

    Windows 8 Automatic Maintainence Question


    Windows 8 Automatic Maintenance is by default scheduled for 3 AM. My computer is powered off at that time. Does it run the next time it's booted up? I see that I am getting updates installed in the morning.

    In a related question, I just looked at the Windows update screen, and I see 18 "Important" updates that have not been installed. I'm wondering if they came in after this morning's update.

    And finally, I have an optional update sitting there: "Canon - Printers - Canon MX450 series FAX".
    I've installed this one, then run an update check, and it still appears. I ran it a couple of times, and it finally went away, but now it's back.

    See below from the update history window:


    Canon - Printers - Canon MX450 series FAX

    Installation date: ‎7/‎6/‎2013 11:28 AM

    Installation status: Succeeded

    Update type: Optional

    Canon Printers software update released in September, 2012

    ---------------
    Canon - Printers - Canon MX450 series FAX

    Installation date: ‎7/‎6/‎2013 8:26 AM

    Installation status: Succeeded

    Update type: Optional

    --------------------
    Canon - Printers - Canon MX450 series FAX

    Installation date: ‎7/‎5/‎2013 10:50 AM

    Installation status: Succeeded

    Update type: Optional

    Canon Printers software update released in September, 2012

      My System SpecsSystem Spec

  2. #2


    Posts : 480
    Windows 8 Pro x64


    Quote Originally Posted by JeffL View Post
    Windows 8 Automatic Maintenance is by default scheduled for 3 AM. My computer is powered off at that time. Does it run the next time it's booted up?
    It runs the next time your PC is idle (see below) and stops when it's complete or you start interacting with the OS (whichever comes first).

    information   Information
    Task Idle Conditions (Windows)

    In Windows 8, Task Scheduler performs the same general user absence and resource consumption checks. However, Task Scheduler relies on the operating system power subsystem to detect user presence. By default, the user is considered absent after four minutes of no keyboard or mouse input.

    The resource consumption verification time is shortened to 10 minute intervals when the user is present. When the user is away, the verification time is shortened to 30 second intervals. Task Scheduler makes additional resource consumption checks for the following events:
    • User presence state changed
    • AC/DC power source changed
    • Battery level changed (only when on batteries)


    When any of the events above happens, Task Scheduler tests the computer for idleness since the last verification time. In practice, this means that Task Scheduler may declare the system as idle immediately after user absence is detected, if the other conditions have been met since the last verification time.

    In Windows 8, the CPU and IO thresholds are set to 80%.
    Last edited by Vadikan; 11 Jul 2013 at 03:35. Reason: info tag
      My System SpecsSystem Spec

  3. #3


    Thanks. I knew about the idle time, but not the 4 minute rule. I also wasn't sure if it would run if powered off at 3AM. It seems to have done that though. I checked it this morning, and the updates had been installed. There was a message in the update window saying that a restart was needed to complete the updates. Apparently, before I got curious and looked at the update window, this has all been working just fine without me noticing anything, except for the occasional installation process when shutting down.

    I did notice another curious thing. There was an important update that was not automatically checked (no check in the check box). I checked it off myself to get it installed.
      My System SpecsSystem Spec

  4. #4


    Posts : 480
    Windows 8 Pro x64


    Quote Originally Posted by JeffL View Post
    I also wasn't sure if it would run if powered off at 3AM.
    It only wakes up your PC if it's in sleep or connected standby AND plugged in, but not if it's turned off or sent to hibernation.

    If this covers all questions you have on automatic maintenance, please mark the thread as solved.
      My System SpecsSystem Spec

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