I did a partial reinstall of Fedora 30 on my XPS13 as I completely failed at migrating it to UEFI from legacy.
Such a weird problem - after a bios update only half the RAM was visible to the OS in legacy mode. I tested with various liveCDs and figured out it was fine in EFI mode so decided to switch it over.
I'd initally assumed it was a RAM module prpblem but it was nothing of the sort. So strange.
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I'd stuck to legacy out of habit as UEFI can be a bit of a pain, but I suppose I should drag my ass into the 21st century.
I might have gone with EFI boot in the very beginning but this laptop started life as an Arch install and I couldn't be arsed with all the UEFI malarky so it's my own damn fault.