System Environment:
--------------------------

--Platform:915 965 
--Architecture(32-bit,64-bit,compatiblity):all 
--2D driver:commit 24248097988775d62f6c416f2988e74d31c91cd0

--3D driver:commit 32134b5508495fbb1d9fc2f844e22fbb082dcda6

--DRM:commit b986d7d2c9090fc62c1853f62886dd124e8066c1


--Xserver:commit3e12c5bb67f3049156475d5cbf4e899aaded76bb

--Kernel:2.6.25.rc3

Bug detailed description:
--------------------------
startx ,run doom3 , the game will run abort, and print: 
WARNING: vertex array range in virtual memory (SLOW)
signal caught: Segmentation fault
si_code 1
Trying to exit gracefully..
idRenderSystem::Shutdown()



Reproduce steps:
----------------
startx , run doom3 


Current result:
----------------
the game will run abort 


Expected result:
----------------
run normally