I have an HDTV connected to my desktop for XBMC. When I start VO in fullscreen mode, it tries to take over both displays, mirroring output to both. It'd be nice to get an "official" solution to this, but I'll post what I'm using for others with the issue.

Start VO, change resolution to match your monitor, but selected windowed mode rather than fullscreen, then run the following

[alexis@fluffy ~]$ wmctrl -r Vendetta -e '0,0,0,-1,-1'
[alexis@fluffy ~]$ wmctrl -r Vendetta -b toggle,fullscreen

If you want it to run on the second display, you need to adjust the first line. For me, it's easy because both displays have the same resolution, I just shift it to

[alexis@fluffy ~]$ wmctrl -r Vendetta -e '0,1920,0,-1,-1'

Hope this helps someone :)

This depends on your window manager. Which one are you using?

It also depends on how you've got things set up in amdcccle (catalyst control center)

I solved this in my netbook by setting up amdccle as two displays, and without Xinerama...
(you'll miss the hability to move windows from one display to the other, but performance improves noticeably in crappy HD6290 + C60 APU)

Provides best performance and flexibility for gaming, and in small screen I usually have VO-wiki and VO map open, for reference.

After gaming, most times I re-enable Xinerama for regular usage.

I use openbox and tint2. I really wanted the ability to move windows between displays, so this works beautifully for me. It helps that the GPU is way way overkill for what it's doing (XBMC and VO on a 6870).

I'm on my Chromebook so can't check what settings I use in amdcccle right now... I'll try to post it later.