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Why is sleep so hard for laptops? (lemmy.world)
submitted 1 year ago by to c/linux@lemmy.world
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And it's crap across the OSes. On Linux laptops don't wake up from sleep, on Windows they keep waking up when nobody asks for it.

In our home office room there's three laptops. My private one running Fedora, my work PC that sadly runs Windows and my wife's laptop also running Windows.

My work laptop and my wife's laptop keep waking up wasting electricity, and my private laptop needs a hard reset to wake it up every second time.

That feature should be stupid simple, yet it doesn't work across the board.

Rant over.

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[–] 44 points 1 year ago (3 children)

The problem is it's not stupid simple, it's actually fairly complicated. Each piece of hardware and its driver must be suspended. The GPU is a particularly tricky one. Its processor must be suspended, and the state saved. In the kernel, the driver must suspend its execution, and likewise save its state. Then on resume, each half has to reload and begin execution again. And if there's any mismatch in the resumed states, the GPU and/or driver crash and probably take the kernel with it.

Now do that for the Wi-Fi, Bluetooth, sound card, USB, disk controller, and every other device.

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