Hello! I installed fedora, and the problem is exactly the same!
But then, I installed kpowersave, and it fixed the problem !
Now, when I trigger the "suspend-to-ram" option, in kpowersave, it goes to 
sleep and wakes up reliably!

I didn't install acpi nor apm.

Thanks !

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blackscreen on wake up after suspend
https://bugs.launchpad.net/bugs/127187
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