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If you only want to switch off the AMD card, all you have to do is to write this in a terminal (in root) :

echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

If you want to automatically disable it on boot, create a "rc.local" file in /etc/rc.d/ (in root), then write in it :

#!/usr/bin/bash

echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

Next, type in your terminal :

chmod +x /etc/rc.d/rc.local