How to install Beryl/AIGLX (Intel i915)

Follow the how-to on beryl project wiki.

If that does not work, check if you have direct rendering enabled (type into the terminal):

glxinfo | grep direct

The output should be:

direct rendering: Yes

If the output says No, check you have direct rendering manager loaded:

lsmod|grep 915

The output should be:

i915   21632  3
drm    74644  4 i915
tsdev   9152  0

If it shows only tsdev line, you can try to configure xorg.conf to driver i810, restart, CTRL-ALT-F1 to terminal session and configure xorg.conf back to use i915. That helped me.