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I have both Gnome and KDE installed on my system. In Gnome I am able to split my desktop across my two monitors. When I go into KDE the monitors are cloned, and when I try to go into the multi-monitor settings, it says that its not able to do it.

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Some more information will be helpful; what linux distro are you using? Are you using Compiz? What kind of video card do you have? – Nextraztus Aug 8 '10 at 21:22
    
Yeah, the extra information will be essential. I know that KDE is able to split its desktop over multiple monitors because that's the setup I have on the computer I'm currently using, but there's probably some configuration you'd have to change in order to do it, and that depends on your underlying hardware and software. – David Z Aug 8 '10 at 22:54
    
I'm using compiz in Gnome, not sure if it's on in KDE. I'm using an onboard video card which has two connections. It's an ATI Radeon HD 4200. – Phenom Aug 9 '10 at 10:35
    
using the open-source drivers, or fglrx? I'm not sure how well fglrx plays with xrandr. – sml Aug 9 '10 at 14:46
    
I'm using the open-source drivers. If I use fglrx then it will work but if I use fglrx then that causes other weird problems in Gnome. – Phenom Aug 10 '10 at 19:11

i successfully used /usr/bin/krandrtray from the package "kdebase-workspace" to manually set the position of the second monitor. krandrtray Multiple Monitors tab. i wonder if the program you used from within KDE was actually the one for gnome? i seem to recall that was my problem at first.

My box is CentOS6.4 gnome and KDE.

$ kded4 --version
Qt: 4.6.2
KDE: 4.3.4 (KDE 4.3.4)
KDE Daemon: $Id: kded.cpp 1031638 2009-10-05 16:59:11Z lunakl $
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