Re: and after disabling UEFI...
"I just got a brand new laptop and the manufacturers advised not to use Linux because the drivers might not be availableI just got a brand new laptop and the manufacturers advised not to use Linux because the drivers might not be available"
That's just fscking laziness on the part of the manufacture. What would it cost them to do a test install of a few popular Linux distros and maybe a couple of xBSDs and then advertise that such and such an OS, version x.x was tested and worked ok with all the inbuilt hardware. They don't have to care about updates or new/old drivers. Just that it worked with a specific version. They already do that with Windows and to a far greater extent so they can have the special permission from MS to put a sticker on the case.
It may or may not generate lots of sales, but I bet it would at least generate enough to more than cover the day or two it would take to run some simple tests.