I have run KDE with a dual monitor setup for the last year... using version 4.1, 4.2, 4.3, and 4.4. I have had no issues with the setup. I was using a single nvidia card configured for twinview driving both displays. Windows would maximize to the display panel they were on, and not across both displays, etc...

Now,

I am trying to setup third display. I have two nvidia cards, one configured for twinview driving 2 display panels, and the other setup as to run a separate X display for the 3rd panel. Unfortunately, when I enable this configuration, the twinview setup has issues. The windows maximize across both displays. The single display setup to run the separate X session seems to be recognized by KDE (mouse cursor is KDEs when positioned in the display), but I cannot do anything with it.

Is this a configuration that is supposed to be supported?

Reading on the Gentoo Wiki about dual displays, there is a flag for disabling multihead referenced, disableMultihead. It mentions that in order to prevent KDE from grabbing all X screens to set this to true in kcmdisplayrc, but this doesn't seem to stop KDE from grabbing them.

welcome to the hell of multi-screen proprietary nvidia+xinerama. you can have the seat next to mine. i have four screens: two twinview screens joined via xinerama. no magic compiz visual effects. screens maximized over two physical screens, not one. no XRANDR. why must the good die young???

/mark

Compiz works for me with no issues. I would be happy if I could have the dual monitor configuration with twinview running kde correctly. Then add the third display and run a different window manager on it, as described in the gentoo wiki.

http://en.gentoo-wiki.com/wiki/X.Org/Du ... in_KDE_4.2

oh, so you're not using xinerama to combine the twinview screen pair with the 3rd screen? it's xinerama that steps on compiz and XRANDR.

/mark

No, no xinerama. I was only trying to setup two screens. One twinview combination, and another for the third monitor. It seems that KDE grabs the second screen. If I could somehow prevent that, I could run a different manager in that X instance.

I have a nvidia card connected to two monitors. I'm using xconf settings to have two different X screens without xinerama. The second screen is always blank.
I google it and I think this is a bug on KDE.
There is any solution now?

Laodiceans wrote:I have a nvidia card connected to two monitors. I'm using xconf settings to have two different X screens without xinerama. The second screen is always blank.
I google it and I think this is a bug on KDE.
There is any solution now?

hi ! (sorry for my bad english)

you must use other window manager for your second screen. I have got tow nvidia card two.