Hi,
iansjack wrote:
Note that Grub can only set modes supported by VBE.
Note that just because VBE and the video card support a video mode it doesn't mean that the monitor itself supports that video mode. In practice, this means "set graphics mode to max. supported by VBE" is the same as "maximise the possibility that the user will see nothing".
You really want to use EDID to ensure that the video mode is supported by both the video card and the monitor. UEFI does this (or at least it's supposed to) so it shouldn't be a problem for "GRUB on UEFI"; but the BIOS doesn't (and as far as I know GRUB doesn't either) so it will be a disaster for "GRUB on BIOS".
Also note that what you really want is the monitor's native resolution, not the maximum resolution that the monitor can down-scale and make blurry.
Cheers,
Brendan