Windows 10: Wake On Lan and S0 power state

Hello everyone,I have been using WOL for many years. I had to change the PC now W11 Pro and now I can't Google any working solution. I followed many tutorials including this one. I found out the problem is the Modern Standby state S0. This is my powercfg -a.The following sleep states are available on this system:Standby S0 Low Power Idle Network ConnectedHibernateThe following sleep states are not available on this system:Standby S1The system firmware does not support this standby state.This standby state is disabled when S0 low power idle is supported.Standby S2The system firmwar

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Wake Timers and Task Schedules do not trigger in S0 Power State or when on Battery

After many hours of testing with a Dell Latitude Laptop (5520) I have isolated a number of issues and not sure if these can be resolved in the OS.

1) Task Schedules and Wake Timers fail to trigger from the Modern Standby S0 power sate.

2) My device has no support for S1-S3. I disabled S0 state to stop the system entering this. So only Hibernate and Off is available.

3) Task Scheduler and Wake Timers fail to trigger for the Hibernate S4 power state when there is no AC power. They work reliably when there is AC power.

Any help or assistance would be greatly appreciated.

 

S0 Low Power Idle (Modern Standby) and wake from sleep

Powercfg /a tells that the only supported sleep state is S0 Low Power Idle. That is a very confusing thing, I could not find satisfactory information by googling. Is that sleep state supposed to arm keyboard/mouse wakeup the exact same way than S3?

I see that if I force S3 (the HKLM\System\CurrentControlSet\Control\Power\PlatformAoAcOverride=0 trick), then sleep mode results in pulsating power button LED. However, when trying to wake from that state, not only keyboard/mouse doesn't work for wakeup, but also pressing the power button results in a crash. Fans turn on, power light turns permanently on, but nothing else happens, no image on the screen. Only holding power down (shutdown) will help at that point.

So in the S0 mode at least I can resume from sleep using power button, but I can't resume with keyboard/mouse. How do I troubleshoot this?

I tried maybe 15 different things already, nothing made any difference. When doing "powercfg /devicequery wake_armed" the keyboard and the mouse are listed. Also the laptop's integrated keyboard doesn't wake the computer and I have done "[x] Allow this device to wake the computer" everywhere I can think of.

Using Windows 10 version 21H1.

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If I insert an old mouse into the USB-A port directly on the laptop, and go to sleep, the mouse does light up (gets power). But no matter how many times I click the mouse, the computer doesn't wake up (and I made sure "[x] Allow this device to wake the computer" is enabled).

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I now tried to wake this computer by WOL (wake-on-lan). I know the magic packet goes through because "WOL - Magic Packet Sender" receives it went sent from another device. However, when sleeping, WOL won't wake it up either. (Wake on magic packet is enabled in the Ethernet adapter Advanced tab in Device Manager.)

 

S0 Low Power Idle (Modern Standby) and wake from sleep

Nice. I have some experience on WOL since it's so important to me and I've set it up on several computers. Also Wake on Wireless LAN (WoWLAN) does exist (both WiFi device as the magic packet sender and as the magic packet receiver). But in my experience, waking is a bit of a gamble. You buy a system and then hope that waking works, often requiring a number steps to get it working (for example with USB devices it matters how your USB devices are connected, with or without hubs etc.).

Now I continue trying to find out how to remotely wake the S0 low idle computer.

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About the energy consumption: I have now measured the temperature. It's 40°C at the bottom on the laptop in the S0 idle (after hours of S0 idle). Also a fan is constantly on (very quiet and low speed, but still it is on). The bottom of the computer feels considerably warm to the hand. Needless to say, this is very bad design. Especially if there's no way to make the idle state much, much less energy consuming. On the bottom of the laptop there's a spot which is "hot", so this mode seems quite far away from the S3 sleep, which would keep a computer somewhere around the room temperature without running fans.

About the WOL when S0 idling: I can't get Add Networking connectivity in Standby to Power Options in Windows 10 working, in other words I can't get "Networking connectivity in Standby" to appear in Power Options, so it's possible that is Disabled permanently. Which might be the reason why I can't get WOL working. Even my ethernet adapter has "Modern Standby WoL Magic Packet" Enabled, it just doesn't work.

What is also surprising is that Google finds only 9 results on "modern standby wol magic packet". So apparently WOL is just not so popular (I do need to use it regularly on multiple computers).