Ah, you mean session restoration rather than reliable sleep. You're probably right. Linux desktops environments (or at least some of them) used to have an atte

Ah, you mean session restoration rather than reliable sleep. You're probably right. Linux desktops environments (or at least some of them) used to have an attempt at something like that, but I think it only worked for applications that made an effort towards it, and I personally haven't even tried to see how or if that works nowadays. Suspend to RAM and hibernation fill that hole for me, although it's admirable if someone has been able to properly solve the problem of restoring the session after a full reboot.