before emerge de xsystem i put in the USE variable the xv, opengl & dga settings. I've a k6-2 with a Nvidia TnT2 with the nvidia.com drivers. The xvinfo command say: Xlib: extension "XVideo" missing on display ":0.0". xvinfo: No X-Video Extension on :0.0
From /usr/portage/x11-base/xfree/files/4.2.0-r9/site.def: #define BuildXvExt YES I thus recommend that you reread the docs that comes with the nvidia drivers, or maybe the Desktop Guide on www.gentoo.org, as this is most probibly a configuration problem. If you attach your XF86Config, maybe we can help.