I never got i810 to work either, but using testing versions for xorg-server and the xf86-video-intel driver solves my problem. I think it is necessary to use xf86-input-mouse & xf86-input-keyboard from testing too (not sure, I think I had an error that went away when I used them). As far as I can tell, my system works fine; I only use those packages from testing, the rest are stable versions.
