Mmmmhh you're only chance would be that it is compiled in the kernel.
I don't know how to check this.
Code:
zcat /proc/config.gz | grep DRM
this assumes you have /proc/config.gz
hum hum
i think its time to recompile your kernel
Or maybe I'm missing something (wait for someone that will help you).
If you recompile I advice:
put DRM as a module
put i915 as a module (it is already the case)
If you have a /boot/configxxx then copy this file in /usr/src/linux, then
make oldconfig
this will keep all the same settings, then
make menuconfig, add the support for DRM.
recompile
pray
boot
Have to leave, bye
good luck