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How to disable modern sleep S3?
Here we are again. Dell blocked the last fix so here is a way to restore normal sleep in the latest bios/windows version
Press start -> type: regedit -> press enter. Then navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\
in the right side of the window right click and select “new”
Enter the 32-bit DWORD value PlatformAoAcOverride and set it to 0.
reboot and normal sleep should be restored (might have to reboot twice for wifi)
If you find any problems just delete the file you created.
Warning! messing in the registry might break windows. For me and others it worked... no garantees.
EDIT: for some insane reason you have to open and close the lid twice before you get wifi back. so not a full fix.
It's not a software issue (mostly). Dell has stopped supporting S3 sleep with their hardware, and doesn't support S0 properly. It causes massive overheating, and wakes when it shouldn't. Modern Standby definitely isn't as good for traveling, but other vendors make it work. If Dell wouldn't have stopped adding S3 sleep to their BIOS/HW it would work fine. I spent 2K on an XPS and Dell officially tells us we can't put it in our bag to travel without turning it off. It's like they went 10 years backwards in terms of technology. Incredibly mad, and will never buy a Dell again if this isn't resolved. I have a similar gen razer laptop that sleeps fine, so it's not software. This is their official stance, shut it down.
Also, it is not just XPS, our company recently bought a Latitude 5511, and it overheats and can't even stay powered for a few hours. It just remains hot in sleep mode. For reference I have a 5580 Latitude from years ago that uses S3 sleep, it was left in sleep mode for a week before it got to 5% battery.
Stijn2
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Posted March 24th, 2021 15:00
EDIT: for some insane reason you have to open and close the lid twice before you get wifi back. so not a full fix.