That might explain why some manufacturers don't invest at all in Linux drivers. However in an alternate reality where they sell Linux laptops and Windows turned

That might explain why some manufacturers don't invest at all in Linux drivers. However in an alternate reality where they sell Linux laptops and Windows turned into a fringe desktop OS for some 2% people (I'm one of those 2% Linux desktop users), hibernation would work very well on Linux and with some luck on Windows. That despite any possible architecture of the Linux kernel: manufacturers would make it work even with a kernel written in COBOL and drivers written in BASIC in a sandboxed DOS virtual machine. /s