Windows 10: Legacy Kernel Caller, cannot be overridden by Requestoverride since Windows 10 version...

This was working correctly in Windows 10 version 1803.

When HW in question is removed "Legacy Kernel Caller" does not appear, and the PC goes to sleep.
Only difference is 1803 to 1809.

:)

 

Won't Enter Sleep - legacy kernel caller


I built a new PC about two months ago, and up until last week, It went to sleep on its own, of manually via power options. The monitor goes to idle, but immediately comes back to login screen, and PC never enters sleep.
I've done a number of searches, and most of these errors seem to suggest driver issues. Other than install Logitech software for my joystick, I haven't added anything new to my system, or updated any of its drivers.

When I run "powercfg -requests" I got Audio stream from Realtek, but after close my browser that would disappear. Now I still get "PERFBOOST: [DRIVER] Legacy Kernel Caller "

I've run Powercfg -requestsoverride Driver "Legacy Kernel Caller" System, but it does nothing, kernel caller still remains.
Last night after running "powercfg -requests", it actually was showing nothing running at all, yet the darn thing still won't enter sleep.

Sys Specs:


i7-6700K Quad-Core - 4.0GHz BX80662I76700K
Gigabyte GA-Z170X-UD5 TH - socket 1151
On-board Realtek ALC1150 High Definition 8 channel Audio
G.SKILL TridentZ Series 32GB DDR4 3200 Model F4-3200C14D-32GTZSW
MSI GeForce GTX 980 Ti Gaming 6G
SSD - Samsung M2 EVO 850 500GB port 0
Corsair HX850i Power Supply
Win 10 Pro 64bit

 

Windows 10 won't sleep: "Legacy Kernel Caller" in PERFBOOST section of "powercfg -requests" at fault?

Today, my Windows 10 just won't go to sleep.

Running "powercfg -requests" shows:

DISPLAY:

None.

SYSTEM:

None.

AWAYMODE:

None.

EXECUTION:

None.

PERFBOOST:

[DRIVER] Legacy Kernel Caller

Power Manager

ACTIVELOCKSCREEN:

None.

I can (and did, to no avail) add "Legacy Kernel Caller" to "powercfg /requestsoverride Driver "Legacy Kernel Caller" system", but it's not in a SYSTEM section, it's in PERFBOOST, and "powercfg /requestsoverride" has no option to
ban a request from there. I found that "powercfg /requestsoverride" actually just manages the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerRequestOverride" registry branch, and tried adding some more extensive bitmasks (0xff, why not?),
but I only managed to override DISPLAY, SYSTEM, AWAYMODE and EXECUTION - nothing on PERFBOOST.

Of course no USB devices are allowed to wake the system up anymore ("powercfg -devicequery wake_armed" is empty), the power plan option allowing timers to wake the system is off.

How do I get it to sleep again?

 

Computer won't sleep

Update: after requestoverride and restarting, powercfg -energy now no longer gives an error about the legacy kernel caller, but the realtek audio system is still preventing sleep.