Need Xorg config file for dual graphics cards, triple monitors

Hey guys, I'm having a bit of trouble getting triple monitors working on my system. The two plugged into the graphics card (radeon x300) work fine, but the one plugged into onboard graphics (geforce 6150SE) refuses to appear in xrandr. I figure I need to make a /etc/X11/xorg.conf.d/10-monitor.conf file but I'm confused about how to do it with separate cards. I find the wiki instructions that I can find confusing, as I've never had to deal with xorg files before (has always autoconfigured for me no problems).
Relevant code:
[greg@spacebar ~]$ lspci | grep VGA
00:0d.0 VGA compatible controller: nVidia Corporation C61 [GeForce 6150SE nForce 430] (rev a2)
02:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]
[greg@spacebar ~]$ xrandr
Screen 0: minimum 320 x 200, current 2960 x 1050, maximum 4096 x 4096
VGA-0 connected 1280x1024+1680+0 (normal left inverted right x axis y axis) 338mm x 270mm
1280x1024 60.0*+ 75.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
DVI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 430mm x 270mm
1680x1050 59.9*+
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
S-video disconnected (normal left inverted right x axis y axis)
[greg@spacebar ~]$ pacman -Q | grep xf86-video
xf86-video-ati 6.14.3-1
xf86-video-nouveau 0.0.16_git20120106-1
xf86-video-vesa 2.3.0-7
[greg@spacebar ~]$ cat /etc/mkinitcpio.conf | grep MODULES=
MODULES="radeon nouveau"
I just can't seem to understand how to write the 10-monitor.conf file. I was wondering if anyone could give me a hand?
Also, the third monitor to be connected via onboard VGA is also 1280x1024 and will be left of the other two.

Depends on the motherboard. This one allows you to enable the onboard graphics only when no external card is found, or always enable. The PCI-E card initialises first, if that helps.
EDIT: Also I can confirm that it can run both cards (all three monitors) at the same time by switching to initialise the onboard card first, however that makes some weird stuff happen so I switched it back. And also the nouveau driver is shown in lsmod, and gets detected in the boot message logs.
Last edited by MisterAnderson (2012-01-26 16:56:58)

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