Latest xf86-video-intel with =xorg-server-1.17.x support.

x11-drivers/xf86-video-intel/Manifest

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+DIST xf86-video-intel-2.99.917_p20160316.tar.xz 935212 SHA256 a09721deb7c94764805f28f00e62285e406ddea9c3cef6d0be19ff357df07610 SHA512 bfa35501509e7cb027f926da63d60273dd403c1cfc8d0f6cbdc8cb129c388d16307d71ae15e1c62071127e5ca02a571083ea6ceac424248ee02551b4b01d9500 WHIRLPOOL 1895102cf7883e9d67752ca9e41a35b339485a521568faf88b562b0be9134cc9f8e5af12c530a0ca4baedfd90cc96725bd97fccc5708fc6e49fba677a759c7fd

x11-drivers/xf86-video-intel/xf86-video-intel-2.99.917_p20160316.ebuild

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+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=5
+
+XORG_DRI=dri
+XORG_EAUTORECONF=yes
+inherit linux-info xorg-2
+
+DESCRIPTION="X.Org driver for Intel cards"
+
+KEYWORDS="~amd64 ~x86 ~amd64-fbsd -x86-fbsd"
+IUSE="debug +dri3 +sna +udev uxa xvmc"
+COMMIT_ID="74cd4d09ae051d3a1f4cb9fe29e656b044f03ece"
+SRC_URI="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/snapshot/${COMMIT_ID}.tar.xz -> ${P}.tar.xz"
+
+S=${WORKDIR}/${COMMIT_ID}
+
+REQUIRED_USE="
+	|| ( sna uxa )
+"
+RDEPEND="x11-libs/libXext
+	x11-libs/libXfixes
+	>=x11-libs/pixman-0.27.1
+	>=x11-libs/libdrm-2.4.29[video_cards_intel]
+	dri3? (
+		>=x11-base/xorg-server-1.17
+	)
+	sna? (
+		>=x11-base/xorg-server-1.10
+	)
+	udev? (
+		virtual/udev
+	)
+	xvmc? (
+		x11-libs/libXvMC
+		>=x11-libs/libxcb-1.5
+		x11-libs/xcb-util
+	)
+"
+DEPEND="${RDEPEND}
+	>=x11-proto/dri2proto-2.6
+	x11-proto/dri3proto
+	x11-proto/presentproto
+	x11-proto/resourceproto"
+
+src_configure() {
+	XORG_CONFIGURE_OPTIONS=(
+		$(use_enable debug)
+		$(use_enable dri)
+		$(use_enable dri3)
+		$(usex dri3 "--with-default-dri=3")
+		$(use_enable sna)
+		$(use_enable udev)
+		$(use_enable uxa)
+		$(use_enable xvmc)
+	)
+	xorg-2_src_configure
+}
+
+pkg_postinst() {
+	if linux_config_exists && \
+		kernel_is -lt 4 3 && ! linux_chkconfig_present DRM_I915_KMS; then
+		echo
+		ewarn "This driver requires KMS support in your kernel"
+		ewarn "  Device Drivers --->"
+		ewarn "    Graphics support --->"
+		ewarn "      Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)  --->"
+		ewarn "      <*>   Intel 830M, 845G, 852GM, 855GM, 865G (i915 driver)  --->"
+		ewarn "	      i915 driver"
+		ewarn "      [*]       Enable modesetting on intel by default"
+		echo
+	fi
+}