Windows 10: Computer cannot go to sleep, legacy Kernel Caller problem

I have a Windows 10 64 bit PC, running an i7 930 CPU from about 10 years ago, old but good hardware. This computer cannot go to sleep requiring me to turn the computer all the way off every time I want it to power down. If I put the computer to sleep it seems to actually enter the sleep state, monitor goes black, the OS does seem to suspend, but the fans do not change at all, the power consumption does not change at all, and the actual hardware seems to never power down at all.


I tried checking for wake problems using a command prompt feature that tells you if anything blocks sleep or requests wake, when it fails sleep it tells me that under PERFBOOST "Legacy kernel caller" is stopping it. I tried to override this, it did not work and nothing changed.


The person who gave me this computer told me that the motherboard has always been a little bit sketchy, apparently it was slightly defective when he bought it and never bothered to return it. It generally works fine but there's little quirks like this sleep problem causing issues. I am pretty certain it should be possible for it to sleep even with a sketchy motherboard though.


Thanks for any help

:)

 

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

 

Legacy Kernel Caller, cannot be overridden by Requestoverride since Windows 10 version 1809. PC won't goto sleep.

Hi



The HW is a TV receiver card, but irrelevant.

I can trace the frequency of “Legacy Kernel Caller” and any other PowerRequest. When I remove this HW the “Legacy Kernel Caller” disappears, and the PC will go to sleep after the scheduled period.

So I think we have isolated that “Requestoverride” does not work at least for “Legacy Kernel Caller”.

The settings were not changed from earlier on 1803, and I could also then trace the frequency of “Legacy Kernel Caller” and any other PowerRequest..

But then override worked.



I have tried most of the below, even set the power plan to defaults and recreated the power plan, which was just timing of turn off display and put the computer to sleep.

The drivers are the newest.

Why should update from 1803 to 1809 justify a bios upgrade.



I suggest that you reproduce the error by finding some way to get “Legacy Kernel Caller” and “Requestoverride” it.



Best regards

Jens

 

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?