Saltgrass
4 Germanium

Re: XPS 13 (9365) lifting the lid wont wake from sleep

The 9365 does not go into sleep mode but a low power mode called Modern Standby.

It will go into hibernation and shutdown, but sleep is not allowed.

If you have the system in laptop mode, when the display turns off it drops into the low power mode and stays there until or if it goes into hibernation.  The display will return by tapping the space bar if the system is still in low power mode.  Such things like Cortana or an Active Pen or Bluetooth mouse may also be able to bring back the display.

The theory is a Low Power mode will save more energy than sleep but still allow the system to be Instant on.

The linked Microsoft video is older and a little out of date but does describe the operation of a Modern Standby system.

https://channel9.msdn.com/Shows/Mechanics/Understanding-Surface-Power-Management-with-Modern-Standby...

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XPS 2720, Inspiron 17 7779, Inspiron 15 7567, XPS 13 9365, Inspiron 1545, TB16 Dock