Fedora Hardware :: Configure Two Video Cards - ATI And Nvidia

Due to the miss of proprietary drivers from AMD for Fedora 12, I have installed a second video card in my system (a Nvidia one) for BOINC calculation. This card is not connected to a monitor.

So in the system I have this two cards:
ATI Shappire Radeon HD2600XT (256MB)
Asus Nvidia Geoforce 6600 (356MB)

The ATI is in the first PCI express device, the Nvidia to the second PCI express:

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So I have used this Xorg configuration file (if I let Xorg to configure without the configuration file, it sets NVidia to default card and X files to start):

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The Nvidia driver were installed as described in some forum:

1) disabling nouveau in grub configuration

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2) Take SElinux to alow the driver:

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With this, the driver is correctly loaded in memory:

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But the Xorg says that not Nvidia Driver where found (see the attack file).

These are the NVIDIA driver installed:

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What can I do to make NVIDIA driver to work?