When the operating system boots up, the kernel will probe for whether a framebuffer is available, it will assign the vesa-framebuffer module to this (or the fbdev framebuffer module) if however there is a dedicated frame buffer module found available during the probe it will replace the generic (vesa/fbdev) with the more appropriate framebuffer option.
available framebuffer options are
cirrusfb == Accelerated FBDev driver for Cirrus Logic chips
gxfb == Framebuffer driver for the AMD Geode GX
gx1fb == Framebuffer driver for the AMD Geode GX1
intelfb == Framebuffer driver for Intel(R) 830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM chipsets
pm2fb == Framebuffer driver for Permedia2 devices
savagefb == Framebuffer driver for S3 Savage PCI/AGP Chips
nvidiafb == Framebuffer driver for nVidia graphics chipset
cyber2000fb == Framebuffer driver for CyberPro 2000, 2010 and 5000
hgafb == Framebuffer driver for Hercules Graphics Adaptor
i2c-matroxfb == Support module providing I2C buses present on Matrox videocards
kyrofb == Framebuffer driver for STMicroelectronics
vga16fb == Framebuffer driver for standard vga
radeonfb == Framebuffer driver for ATI Radeon chipset
aty128fb == Framebuffer driver for ATI Rage128 / Pro cards
atyfb == Framebuffer driver for ATI Mach64 cards
cyblafb == Framebuffer driver for Cyberblade/i1 graphics core
tdfxfb == Framebuffer driver for 3Dfx devices
sisfb == Framebuffer driver for SiS 300/540/630/730/315/55x/65x/661/74x/330/76x/34x, XGI V3XT/V5/V8/Z7
arcfb == Framebuffer driver for Arc monochrome LCD board
neofb == Framebuffer driver for NeoMagic PCI Chips
s1d13xxxfb == Framebuffer driver for S1D13xxx devices
vfb == Framebuffer driver for virtual fb
i810fb == Framebuffer device for the Intel 810/815 and compatible cards
sstfb == Framebuffer driver for 3dfx Voodoo Graphics and Voodoo2 based video boards
tridentfb == Framebuffer driver for Trident cards
ok next question is
what is a framebuffer and what is the
Linux-FramebufferWith the use of the framebuffer you can present graphical content without using "X".
that line of text is informational and can be necessary for troubleshooting.
Jase