EDIT 2: While what is described below worked for me, @mow’s method seems to be the way to go
Just got my V recently too and running Ubuntu 18.10 on it as we speak. I too had issues with getting Linux bootable on the V’s EFI.
Here’s how the way I did it: After installing Ubuntu, the V booted into Windows, so I went into the extended restart menu in Windows or whatever it’s called (hold Left Shift while clicking Restart), select extended options and then Boot different OS or Boot USB device, whatever of the two pops up, for me it was the later. (Make sure you don’t actually have an USB stick stuck in your device).
That should get you into your Linux (if you installed it correctly in EFI mode), from there installed rEFInd from the PPAs. From then on, whenever I boot my V it interestingly goes into the Grub boot screen instead of rEFInd but at least I can boot Ubuntu from there.
Note that the procedure described is what should get it working. I also tried using the boot repair tool from the PPAs but it didn’t change anything, except for another useless EFI entry.
EDIT: As for suspend, I set the power button to suspend my device in the Gnome settings and I can successfully suspend it via the button press and wake it again via keyboard inputs. Maybe that helps.