I haven't been able to get chvideomode to work under Virtualbox. The OS itself is rather cool, I think I will try to write a simple graphical demo to try it out.
I appreciate you actually trying my OS and leaving a comment. chvideomode really should work under VirtualBox. If there's a bug on my end, I would really like to fix it. Could you show up in #sortix on Freenode IRC for a debugging session?