Intel

intel is the X.Org graphics driver for Intel GMA onboard graphics card, starting with the Intel i810.

Kernel
You need to activate the following kernel options:

Driver
Note the USE flags of :

VAAPI
Intel GMA X4500HD and newer supports VAAPI hardware video acceleration.

Troubleshooting

 * fdo bugtracker: xf86-video-intel known bugs
 * fdo bugtracker: Intel DRM known bugs
 * fdo bugtracker: Intel DRM known bugs

KDM freezes
A workaround is to set TerminateServer=true in all sections of the file /usr/share/config/kdm/kdmrc, which starts with X-.

External resources

 * Homepage
 * X.Org Website