My Lenovo laptop's settings:

  • is plugged in
  • no screensaver
  • "never" go to sleep/hybernate set to all settings in advanced power options

When music is playing or watching video everything works fine.
But when nothing is happening pc goes to sleep after ~1 min.
Not sure, but it doesn't happen right after restart, only after I begin working.
Here is the system log for sleep event:

  • System

    • Provider

    [ Name] Microsoft-Windows-Kernel-Power [ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4} EventID 42 Version 2 Level 4 Task 64 Opcode 0 Keywords 0x8000000000000004

    • TimeCreated

    [ SystemTime] 2015-10-13T20:02:20.555603100Z EventRecordID 1736 Correlation

    • Execution

    [ ProcessID] 4 [ ThreadID] 4412 Channel System Computer pcname Security

  • EventData

    TargetState 4 EffectiveState 4 Reason 7 Flags 0

How can I solve it?

2

2 Answers

It is the System unattended sleep timeout setting.

By default it is set to 120 seconds and is hidden.

Setting the registry data Attributes under key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0 to value 2 (or 0) makes the option appear in the advanced power settings, under Sleep and can be set to something normal.

Source:

1

have had issues with Windows not using the sleep settings configured in settings and found that on some machines there is a hidden power setting called Sytem Unattended Sleep Time-out in the advanced power config. The link below shows you how to view / change this setting. If I ever come across a machine that goes to sleep irrespective of the time set in settings this is the first thing I check

2