qlist -IvU xorg-server x11-drivers/
x11-base/xorg-server-1.9.5 (nptl static-libs udev xorg xvfb)
x11-drivers/nvidia-drivers-270.41.19 (acpi gtk kernel_linux)
x11-drivers/xf86-input-evdev-2.6.0
x11-drivers/xf86-input-keyboard-1.6.0
x11-drivers/xf86-input-mouse-1.7.0
x11-drivers/xf86-video-fbdev-0.4.2
x11-drivers/xf86-video-nouveau-0.0.16_pre20110323
x11-drivers/xf86-video-nv-2.1.18
x11-drivers/xf86-video-vesa-2.3.0