Intel

intel is the open source graphics driver for Intel GMA onboard graphics cards, starting with the Intel 810.

Hardware detection
To choose the right driver, first detect the graphics card. You can use lspci for this task:

Kernel
You need to activate the following kernel options:

Driver
Note the USE flags of :

VAAPI
Intel GMA X4500HD / G45 / GM45 and newer supports VAAPI hardware video acceleration.

Troubleshooting

 * Guide, how to report bugs upstream
 * Guide, how to report bugs upstream
 * Guide, how to report bugs upstream
 * Guide, how to report bugs upstream

KDM freezes
A workaround is to set TerminateServer=true in all sections of the file, which starts with X-.

External resources

 * X.Org Wiki