I too had a similar issue. I'm posting because this thread is one of the top results Google gives for Windows 10 sleep problems.
The solution that worked for two computers I had that were not sleeping was as follows:
- Run an admin command prompt
- powercfg -requests
- This command lists all processes or services currently running that are preventing the computer from sleeping. The list is helpfully broken down by categories. One of my affected computers had sleep blocked by the IncrediBuild component of Visual Studio,
the other by a different TSR program.
I have an AMD Radeon RX580 video adapter with latest drivers. The monitor turns off and immediately after a second it will turn back on.
Using "powercfg /requests" from Command Prompt gives nothing.
C:\WINDOWS\system32>powercfg /requests
DISPLAY:
None.
SYSTEM:
None.
AWAYMODE:
None.
EXECUTION:
None.
PERFBOOST:
None.
ACTIVELOCKSCREEN:
None.
And now what...?
Uninstalling latest AMD Drivers and using the one from Microsoft which in turn has an exclamation mark in device manager turns off the display properly.
Sounds like a complete nonsense Microsoft...
If I install latest driver without reboot the display turns off properly. If I reboot the computer the display will no longer turn off.
I have Microsoft Wireless Desktop 3050 - keyboard and mouse.
When I unplug the USB transceiver the display turns off properly as it used to before updating to 1809. If the transceiver is plugged into a USB port the PC monitor turns off and immediately after a second it will turn back on. All of this won't happen if
I uninstall AMD graphics driver.
There is something wrong with this combination of software/hardware Windows 10 October update 1809, Microsoft Wireless Desktop 3050 and AMD Radeon Graphics (RX580 in my case).
**I suggest everyone with this problem just to use Feedback Hub from start menu and report the issue to Microsoft.**Windows Key+F