V4.3.1 GRUB video definition stuck in 1024x768

Hello humans!

Context:
As soon as v4.3 was available, I’ve done a fresh install with no problem but the resolution of Grub: cannot get it properly set (1024x768!). Plus grub does’nt recognize command like ‘videoinfo’ or ‘vbeinfo’ (say they doesn’t exist).

With every other preceding version, Grub had a proper video definition on my computer.

Actions:

Checking dom0 for Grub setup, I found out that Grub modules for EFI64 aren’t availbale on FS, whereas related packages are said installed. I’ve tryed to force the reinstallation of those packages (+“Grub Install” +regenerate boot images, etc.) without any success.

Run out of idea.

Any suggestions?