mkdir -p /etc/portage/package.{mask,use} /etc/portage/profile
echo 'VIDEO_CARDS="vesa intel"' >> /etc/portage/make.conf
echo '-libkms' >> /etc/portage/profile/use.mask
echo 'media-libs/mesa -llvm -xvmc' >> /etc/portage/package.use/video-intel
echo 'x11-libs/libdrm libkms' >> /etc/portage/package.use/video-intel
echo 'x11-drivers/xf86-video-intel -sna uxa' >> /etc/portage/package.use/video-intel
echo '>media-libs/mesa-9.2' >> /etc/portage/package.mask/video-intel
echo '>=virtual/opengl-7.0-r1' >> /etc/portage/package.mask/video-intel

mkdir -p /etc/portage/patches/{x11-libs/libdrm,x11-drivers/xf86-video-intel}
wget -O /etc/portage/patches/x11-libs/libdrm/libdrm-2.4.49-fbsd-drmMode.patch \
"http://svnweb.freebsd.org/ports/head/graphics/libdrm/files/extra-xf86drmMode.c?revision=300896&view=co"
wget -O /etc/portage/patches/x11-drivers/xf86-video-intel/xf86-video-intel-2.99.906-i915kms-fbsd.patch \
"http://svnweb.freebsd.org/ports/head/x11-drivers/xf86-video-intel/files/extra-i915kms?revision=328711&view=co"
wget --no-check-certificate -O /etc/portage/patches/x11-drivers/xf86-video-intel/xf86-video-intel-2.99.906-fbsd.patch \
"https://bugs.gentoo.org/attachment.cgi?id=364700"



FYI,
Console is blank when exit X.
http://freebsd.1045724.n5.nabble.com/Xorg-Radeon-td5844771.html