We have to remove the vga fallback because this not work on bay-trail and other
new intel onboard graphics.

diff -Naur grub-2.02.org/grub-core/video/i386/pc/vga.c grub-2.02/grub-core/video/i386/pc/vga.c
--- grub-2.02.org/grub-core/video/i386/pc/vga.c	2015-05-21 17:50:29.000000000 +0200
+++ grub-2.02/grub-core/video/i386/pc/vga.c	2018-04-15 22:24:41.686842878 +0200
@@ -122,7 +122,7 @@
 {
   grub_err_t err;
 
-  if ((width && width != VGA_WIDTH) || (height && height != 350 && height != 480))
+//  if ((width && width != VGA_WIDTH) || (height && height != 350 && height != 480))
     return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no matching mode found");
 
   vga_height = height ? : 480;