Compiz-fusion on Thinkpad SL400, NVIDIA Card.

1 - Set USE flags

x11-libs/libX11 and media-libs/mesa with xcb enabled.

x11-libs/cairo with glitz, xcb and svg enabled.

x11-wm/compiz-fusion with emerald enabled.

2 - Keywords

dev-python/compizconfig-python

x11-wm/compiz

x11-wm/compiz-fusion

x11-plugins/compiz-plugins-main

x11-plugins/compiz-plugins-extra

x11-plugins/compiz-plugins-unsupported

x11-wm/emerald

x11-themes/emerald-themes

x11-apps/ccsm

x11-libs/libcompizconfig

x11-libs/compizconfig-backend-gconf

x11-libs/compizconfig-backend-kconfig

x11-libs/compiz-bcop

3 - Emerge

emerge compiz-fusion

4 - Usage for nvidia card

LIBGL_ALWAYS_INDIRECT=1 INTEL_BATCH=1 compiz --replace --indirect-rendering --sm-disable ccp

5 - GNOME setting

Navigate to System > Preferences > Startup Applications

Add a new Program to the session list named Compiz-Fusion and path /usr/bin/compiz-manager

Add a new Program to the session list named Emerald and in command "emerald --replace"

Save the settings and relog to test.