TwinView, Xinerama, 2 x Geforce 6800GT, KDE

[patrickkidd]

I'm a bit confused about TwinView, Xinerama, USE flags and KDE. I use an SLI motherboard with two 6800GTs and two monitors. The way I understand it now, one X Display must use either TwinView or Xinerama, but not both.

When I've used TwinView in the past I've had one desktop that spanned both monitors, and KDE (with USE="xinerama") would maximize windows only within the current monior. I was confused about KDE and the xinerama USE flag, but I tried lots of combinations and got it to work with TwinView enabled, and life was good.

So now I have two 6800GT cards connected with the motherboard's SLI connector, and things are more complicated. Now I get two X *displays*, and two seperate desktops, one on each monitor, but the mouse, and not windows, is shared between them. Windows don't drag between monitors, but wrap the the other side of that same monitor they were created in when the pointer reaches the edge of the monitor. I have to click to focus on each monitor. In nvidia-settings, and I see two X displays, localhost:0.0, localhost:0.1.

If I disable TwinView and enable Xinerama (Option "Xinerama" "on"), The displays switch sides (Screen 1 "Screen 1" LeftOf "Screen 0"), but the maximizing doesn't work.

Also, I the nvidia driver says it doesn't support multiple monitors in SLI mode (Option "SLI" "on"). Does anyone have any comments about this? It would be great to have two monitors with good maximizing and SLI enabled. Does anyone have a good explanation of TwinView, Xinerama and KDE, and using two cards connected with an SLI connector? Thanks!