id	summary	reporter	owner	description	type	status	component	version	resolution	keywords	cc	guest	host
6827	GA doesn't add vboxvideo to xorg.conf	Bryce Schober		"I've been having black-screen problems and seamless mode not working correctly, and I eventually noticed that my xorg.conf didn't have the following line in the ""Device"" section:
    Driver    ""vboxvideo""

More detail and history is on the forum at:
http://forums.virtualbox.org/viewtopic.php?f=3&t=31439&start=0"	defect	closed	other	VirtualBox 3.2.0	wontfix	black screen seamless mode		Linux	Linux