Linux kernel VGA table

                           Resolution in pixels
Color depth      |   640x480      800x600      1024x768      1280x1024
256        (8bit)|     769          771           773           775
32000     (15bit)|     784          787           790           793
65000     (16bit)|     785          788           791           794
16.7 Mill.(24bit)|     786          789           792           795

via: http://en.opensuse.org/SDB:Setting_up_Unsupported_Graphics_Cards_with_the_Framebuffer_Device_(GRUB)
Linux video mode numbers (Wikipedia)

Intel 800/900 Series VBIOS Hack : version 0.5.2

Chipset: 915GM
BIOS: TYPE 1
Mode Table Offset: $C0000 + $269
Mode Table Entries: 36

Mode 30 : 640x480, 8 bits/pixel
Mode 32 : 800x600, 8 bits/pixel
Mode 34 : 1024x768, 8 bits/pixel
Mode 38 : 1280x1024, 8 bits/pixel
Mode 3a : 1600x1200, 8 bits/pixel
Mode 3c : 800x480, 24 bits/pixel
Mode 41 : 640x480, 16 bits/pixel
Mode 43 : 800x600, 16 bits/pixel
Mode 45 : 1024x768, 16 bits/pixel
Mode 49 : 1280x1024, 16 bits/pixel
Mode 4b : 1600x1200, 16 bits/pixel
Mode 4d : 800x480, 16 bits/pixel
Mode 50 : 640x480, 32 bits/pixel
Mode 52 : 800x600, 32 bits/pixel
Mode 54 : 1024x768, 32 bits/pixel
Mode 58 : 1280x1024, 32 bits/pixel
Mode 5a : 1600x1200, 32 bits/pixel
Mode 5c : 800x480, 32 bits/pixel