Failed to start X server when booting Gentoo

[nedman]

The booting screen resolution is messed, then it turns to normal like you load
the live cd, it is trying to load local but flashes three times and comes out
to an error that looks like this:

failed to load module "synaptics" (module does not exist, 0)
Intel: No matching device section for instance (BusID PCI:0:3:1) found
Module already built-in
GARTInit: Unable to open /dev/agpgart (No such file or directory)
Intel(0): Failed to allocate framebuffer. Is your VideoRAM set too low?
Intel(0): Couldn't allocate video memory

Fatal server error:
AddScreen/ScreenInit failed for driver 0

Failed to start the X server (your graphical interface). It is likely that it
is not set up correctly. You will need to log in on a console and reconfigure
the X server. Then restart GDM.

[timeBandit]

Moved from Kernel & Hardware to Duplicate Threads. See Failed to start X server in Desktop Environments.

No cross-posting (see #12), please.
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