It's Avast alright an not something else. Although one can never rule out something else, but in this case, Avast.
- Open Windows Event Viewer
- Go to System Log
- Filter on Source 'UserModePowerService'
You'll find entries like:
Process C:\Program Files\AVAST Software\Avast\AvastSvc.exe (process ID:2944) reset policy scheme from {a1841308-3541-4fab-bc81-f71556f20b4a} to {8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c}That's when Avast changed your power plan. If you want to know the display names of the power plans, you can do this in a Powershell prompt:
PS> Get-WmiObject -Class win32_powerplan -Namespace root\cimv2\power | select ElementName,InstanceID
ElementName InstanceID
----------- ----------
Balanced Microsoft:PowerPlan\{381b4222-f694-41f0-9685-ff5bb260df2e}
High performance Microsoft:PowerPlan\{8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c}
Power saver Microsoft:PowerPlan\{a1841308-3541-4fab-bc81-f71556f20b4a}So in my case Avast changed from Power saver to High Performance. Since my laptop makes a lot of noise on High Performance and since Avast changes the plan randomly (sometimes within one minute after I've set it back, or after four or five minutes or even after ten minutes), it is pretty annoying.
I use the tool AC-Power Saver in the tray to change the power plan. Now I've changed te plan to High Performance and then back again to Power saver via the Control Panel > Power Options, see if that helps. 14 minutes past since and Avast hasn't switched it back to High Performance yet. Fingers crossed.
But they really need to fix this.
