[arch-general] S3-level ACPI suspend

[b4283]

I think I nailed it.

With luck, I was able to resume the computer with "s2ram -f -a 1", even
it's within Xorg. But it still takes a long time to resume, then I found
out about my drives hooked on an old IDE extension card stopped working.
So I removed the module "pata_hpt37x", and...

Wala, 11 seconds !

Now it's only issue is to automated this umount+rmmod and modprobe+mount
thing...