Over the past few years more of the Linux graphics stack has moved within the Linux kernel so that there is finally a proper kernel memory management solution for the open-source graphics drivers and to also provide kernel mode-setting. Moving more of the GPU driver code into the kernel DRM results in a more secure environment as the X Server can now run without root access, the start-up process is cleaner and faster with KMS, the performance will ultimately be better with a memory manager, there's more reliable and faster VT switching, suspend and resume is better, and the list of benefits just goes on.