Laptop wakes from sleepmode when plugged into A\C

Sometimes your computers firmware, which deals with things like power management, which is related to sleep needs to be updated. Remember, the issue you are experiencing here is outside of Windows, where its not resuming from sleep. Windows is in a saved state on the hard disk and can't manage the hardware resources, thats left up to Firmware (your BIOS) to handle. So, its obvious this more a hardware issue than software, but updated driver software can fix it.

It could suggest you need to update your chipset drivers and BIOS.
I recommend you update the most critical ones: BIOS, Chipset, Display Driver, Network adapters.
If that does not work, I recommend you try two things
First: Boot to the Windows 10 desktop
Press Windows key + X
Click Device Manager
Expand Batteries
Right-click Microsoft ACPI-Compliant System.
Choose Update Driver Software.
Make sure you are connected to the Internet, the check for updates.

When complete, restart then check if you can sleep and wake.

Second option
uninstall your display driver then restart
Boot to the Windows 10 desktop

Press Windows key + X
Click Device Manager
Expand Display adapters
Right click the current display adapter
Click Uninstall
Exit Device Manager
Restart

If that does not work, well, we need to try something else. Try resetting the BIOS:
https://www.groovypost.com/howto/reset-pc-bios-...

Hi BitGamer. I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.

What standby mode? In Power options are you referring to Display, Sleep or Hibernate timeout?

Go to Settings > System > Power & Sleep > Additional Power Settings > Change Plan Settings to Restore Default Settings for this plan. I suggest Balanced or High Performance plan. To access another plan that isn't showing right click the Battery Icon in System Tray (at right end of task bar) to choose Mobility Center.

Why is the power adapter disabled in registry? I would change that back along with any other changes made in Registry. If you have a System Restore point from before you made these changes I would use it: http://home.bt.com/tech-gadgets/computing/how-t...

Find the battery listing in Device Manager reached by right clicking the Start button, right click ooth the Power Adapter and Battery (one at a time) to Reinstall, restart PC to reinstall their drivers.

I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.

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I'm sorry I mean the 'Power on A/C registry setting' is not enabled in the bios. I've mentioning it because that setting will wake a system from standby when connected to A\C. I'm referring to standard 'Sleep' mode not hibernation. It do know the issue revolves around connected standby mode. If I disable connected standby by setting CsEnabled to 0 in the registry the issue goes away. However some Windows updates like the 1803 re-enables connected standby and issue crops up again.