An X driver (/usr/lib/xorg/modules/drivers/via_drv.so); this driver is needed by the X server to use your VIA hardware.

An OpenGL library (/usr/lib/libGL.so.x.y.via_chrome9; /usr/lib/libGL.so.x.y.via_unichrome); this library provides the API entry points for all OpenGL and GLX function calls. It is linked to at run-time by OpenGL applications.

An OpenGL DRI driver (/usr/lib/dri/via_chrome9_dri.so; /usr/lib/dri/via_unichrome_dri.so); this module prepares buffers of commands to be sent to the hardware by the DRM, and interacts with the windowing system for synchronization of access to the hardware. .

A kernel module
(For SUSE Linux Enterprise Desktop distributions >= SLED 11:
/lib/modules/`uname -r`/kernel/drivers/gpu/drm/via_chrome9/via_chrome9.ko;
/lib/modules/`uname -r`/kernel/drivers/gpu/drm/via/via.ko;
For Ubuntu 8.10:
/lib/modules/`uname -r`/kernel/drivers/ubuntu/via_chrome9/via_chrome9.ko;
/lib/modules/`uname -r`/kernel/drivers/gpu/drm/via/via.ko;
For earlier distributions(kernel version < 2.6.27: e.g. Debian 5.0.3):
/lib/modules/`uname -r`/kernel/drivers/char/drm/via_chrome9/via_chrome9.ko;
/lib/modules/`uname -r`/kernel/drivers/char/drm/via/via.ko);
this kernel module provides low-level access to your VIA hardware for all of the above components. It is generally loaded into the kernel when the X server is started, and is used by the X driver and VIA OpenGL DRI module consists of two pieces: the binary-only core, and a kernel interface that must be compiled specifically for your kernel version. Note that the Linux kernel does not have a consistent binary interface like the X server, so it is important that this kernel interface be matched with the version of the kernel that you are using. This can either be accomplished by compiling yourself, or using precompiled binaries provided for the kernels shipped with some of the more common Linux distributions.