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Please note that I don't know much about xorg.conf editing, and I am still learning Linux, so I am just posting this to try and help you along the way. This is what I thought might be possible when I read your post.
It might be a solution to write two different xorg.confs, and then switch between using them by renaming them, so that at any given point you have one xorg.conf.radeon and one xorg.conf.fglrx. You would then use one of them by renaming it to just xorg.conf, and restarting your xserver.
I don't know how efficient this is, or how well it would work, but at least it is some thoughts on the subject that may help you along.
Well i thought of that. But My experience with installing the fglrx is that it didn't really work that well cause to use the mesa based ati/redeon driver always needed an install then reboot first. Then on reboot the old drivers modules would be removed.
Would it then be possible to make a script to load or unload modules without having to reinstall each?
If YOU need to reboot YOUR system after changing the Kernel modules, then the shell scripts need to be set to the files that the system knows are Not temporary. So the shell scripts do Not need to be repeated. If the Kernel is loading the modules; one ATI module per reboot, it should work. If it were me, I'd use two Distro's in the same Linux Box.
Yes, that should be possible. You would have to switch drivers und the device section of xorg.conf (radeon to flgrx or the other way round) and then hit ctrl + alt + backspace). It's a bit inconvenient but it generally works; having a script would make it more convenient, of course.
Well, yes, but I wouldn't recommend it because the home directory contains some vital configuration files. Having two of the same OS most probably reduces the risk of running into conflicts but still wouldn't use a single home. What you can do as an alternative is leave home under / for both OSes and then make a separate data partition that will be shared by both. This partition can be made after installing but it can just as well be created during install: give it a mountpoint while installing the first, then use that same mountpoint while installing the second and tell the installer to preserve its contents. If you intend to use different OSes, things may get more complicated because they may assign different UIDs & GUIDs.
Btw, I'm surprised that simply restarting X didn't work. It works alright for me but maybe that's just another difference between ATI and Nvidia.
I maintain two different xorg.conf files -- one uses the "fglrx" driver, and the other uses the driver "ati". I run dual monitors, and had trouble with fglrx using the second monitor correctly. So when I want to play a game, I just copy xorg.conf.fglrx to xorg.conf and restart X. Otherwise, I copy xorg.conf.ati to xorg.conf and restart X (and use both of my monitors.)
A bit clunky, but it works. ;-)