Hi! Small update: I made an Ubuntu package out of this modified Xephyr. I don't if it can be useful to anyone, or whether it is easy to convert it into an RPM, but here it is anyway: http://www.manucornet.net/pub/olpc/xserver-xephyr_6.6.1-0ubuntu4_i386.deb You'll want to run Xephyr as: Xephyr -screen 1200x900x16 -ac :1 Cheers, Manu