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:

3D/GL support
is used for actual 3D/GL support. Note that it has three VIDEO_CARDS flags for intel hardware depending on the hardware model and the kind of MESA driver you want to use. MESA has two architectures for drivers - classic and gallium. The later is the newest architecture in MESA, but for Intel hardware the best support is in classic MESA drivers. For older intel graphics cards use i915, but for hewer (gen6/Sandy Bridge and later) use i965. If none of those are specified, both drivers will be built.

Video driver
Note the USE flags of :
 * dri - (Recommended) Enable hardware acceleration.
 * sna - Enable SandyBridge's New Acceleration - a new driver optimization. Also applicable for older graphic cards.

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

Configuration and Setup
Your user has to be in the video group to be able to use the hardware acceleration:

Alternatively you can enable the ACL suppport for device nodes.

Troubleshooting

 * Gentoo Bugzilla xf86-video-intel: known bugs
 * Upstream Bugzilla xf86-video-intel: 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-.

Links

 * Homepage
 * X.Org Website