And what about when a notebook is encrypted?

Encrypt swap as well (on a laptop, something like: one boot-partition (unencrypted) and on big crypt-partition that contains a LVM PV, which contains multiple LVs, of which one is the swap; so you only have to enter one key). You'll need some form of InitRD to handle the decryption of swap (dracut can do this), before the kernel can use it to load the old memory-image, but that actually works reasonable well; tested it myself on my laptop.