Cannot make GRUB2 use (perfectly-working) max resolution

My arch installation is still in its infancy console-only (no X installed) and it is perfectly working @ 1920x1200 native resolution on a Dell Inspiron 9400 E1705 with ATI Radeon X1400 @ 1920x1200 (aka WUXGA mode) with the xf86-video-ati driver installed and the corresponding RADEON module on (/etc/mkinitcpio.conf) for early KMS start.
cat /sys/class/graphics/fb0/virtual_size ... reports 1920x1200
However, when I boot and enter GRUB2 console and run VBEvideo to show all supported resolutions it shows preferred-resolution=1920x1200 but current-resolution=1600x1200 and there's no entry for the native 1920x1200 resolution -the closest one is 1920x1440 which does not fit my laptop screen; which perfectly explains why GRUB2 is using what is currently using.
Obviously, switching the associated GRUB_GFXMODE entry from =auto (default) to =1920x1200 in (/etc/default/grub) and then running grub-mkconfig --output /boot/grub/grub.cfg does not make any changes: it always ends in 1600x1200 for the boot screen.
GRUB2 works fine. Arch works fine too. Only problem I am trying to fix is some screen flash when GRUB2 turns control to linux and thus is how I discovered the GRIB2 entry for video.
Any clues why GRUB2 is not listing/supporting a video mode that is obviously supported on this particular laptop and/or linux installation ?

Although I still can't find conclusive evidence on this matter what you tell me seems to be right: for what I learned so far GRUB2 loads some very-basic VESA driver and maybe this is the key issue here for non-standard resolutions -mine @ 1920x1200 (widescreen) sure it is not.
Anyway thanks for your help

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Cannot make GRUB2 use (perfectly-working) max resolution

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