Some of you must have heard about a new feature that got introduced since 2.6.29 Linux kernel known as Kernel Mode Setting (KMS).I will not go into the details about the benefits of KMS in this post but rather I will show you how to enable KMS on your Debian system More here
KMS is a feature now in Linux kernel which will do the work of setting your screen resolution, depth, colors, etc. Earlier this was done by the XOrg graphics drivers. For example, before the kernel version 2.6.28, when you use to change your screen resolution from your GNOME/KDE, the XOrg driver use to do it. Now the same task is moved into the Linux kernel to speed up the things.