Oh man...this is probably going to sound weird that I'm suggesting this as the culprit. Did you update the ASUS Screen Saver program to the latest version (2.0.8 last I checked) by any chance?
I had this very problem you're describing and version 2.0.8 of ASUS Screen Saver from the official support site caused this problem. The stock version on my laptop, version 2.0.5, didn't create this behavior. Originally, I had thought this only happened once and sometime after boot, but I started to notice this was a regular occurrence.
Long story short, I only know the latest version of the ASUS Screen Saver utility caused the problem because Windows Event Viewer was pointing out this behavior and the offending executable.
Check my thread here where I went into quite a bit of detail:
G751JY - Power Management plan keeps reverting to "High Performance" after boot.If you're not using version 2.0.8 of the ASUS Screen Saver utility, here are the steps I recommend you follow to help you diagnose the issue:
- Pay very close attention to your laptop's behavior. When your power management setting automatically switches to High Performance you should note the time of occurrence down to the very second.
- Open Event Viewer found within the Administrative Tools folder from the Start screen (or Start menu if you're a Start8/Classic Shell user).
- Within Event Viewer, look for system events under Windows Logs > System. Organize all events by date and time, then find any timestamps matching what you noted from last occurrence of this bug.
- Clicking any matching timestamps under the source UserModePowerService. The bottom half of the Event Viewer screen will give further information about the event you clicked, where you can find the name of the executable file linked to the event.
I attached a sample image of the Event Viewer. Please, share your results whenever it's convenient for you to do so.
🙂
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