Nevermind, the end user was dumb as usual. I've developed a habit of doing grub2-mkconfig -o /boot/grub2/grub.cfg which efi grub ignores, storing it's config on the ESP instead. So you should do grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg I wondered why this "video=efifb:off" wouldn't appear on the /proc/cmdline even though it was everywhere else being /etc/default/grub or /etc/sysconfig/grub. That was exactly the reason.
Please, make a fix to your blogpost about host configuration, part 3 regarding EFI hosts. Also, that's the reason for all else problems. I, however, wonder how i've managed to get iommu=pt into config without thinking about different paths. The video=efifb:off is also (almost) documented there, a copy of once TLDP document: http://www.faqs.org/docs/Linux-HOWTO/Framebuffer-HOWTO.html
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