VBE driver can't copy Video BIOS on some machines
The (loko drivers video vbe)
driver tries to copy the Video BIOS from the graphics card. On some machines the BIOS has configured the expansion ROM BAR incorrectly, or has configured the bridges incorrectly, etc. In these cases it's not possible to copy the ROM (at least not without much extra effort). But there is probably a copy of the primary graphics card's ROM at c000:0 that supports the "Protected Mode Entry Point". This may be more reliable than the current method.