I finally managed to get dualhead running with the nv-driver. I switched away from the nvidia binary ones due the slow performance on kde4. no glossy anymore, but at least its fast, compared to the binary its a rocket. Really easy to do, when you know how 😉
so, edit xorg.conf or take mine as example (you should not have any mess from other drivers)
thinks to change are marked bold
Section „InputDevice“
Identifier „Generic Keyboard“
Driver „kbd“
Option „XkbRules“ „xorg“
Option „XkbModel“ „pc105“
Option „XkbLayout“ „ch“
EndSectionSection „InputDevice“
Identifier „Configured Mouse“
Driver „mouse“
Option „CorePointer“
EndSectionSection „Device“
Identifier „Configured Video Device“
Driver „nv“
BusID „PCI:1:0:0“
EndSectionSection „Monitor“
Identifier „Configured Monitor“
EndSectionSection „Monitor“
Identifier „Configured Monitor1“
EndSectionSection „Screen“
Identifier „Default Screen“
Monitor „Configured Monitor“
Device „Configured Video Device“
DefaultDepth 24
SubSection „Display“
Depth 24
# ADD A VIRTUAL LINE TO PROVIDE FOR THE LARGEST SCREENS YOU WILL HOTPLUG
Virtual 1280 1792
EndSubSection
EndSectionSection „ServerLayout“
Identifier „Default Layout“
Screen 0 „Default Screen“
InputDevice „Generic Keyboard“
InputDevice „Configured Mouse“
EndSectionSection „ServerFlags“
Option „RandR“ „on“
EndSection
after restarting X (Ctrl-Alt-Backspace) you can do the following comands (as the kde4 display options dont let me setup anything other than clone)
xrandr #to see what your output names are xrandr --output DVI0 --auto --below VGA2
if you get a „connot be larger than“ error, you have to adjust the „Virtual“ in xorg.conf
Update
After Upgrading to KDE 4.1 Release it dont save my xrandr settings anymore, so i created a litte script like this:
nano ~/.kde4/Autostart/bashscript#!/bin/bash xrandr --output DVI0 --auto --below VGA2