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Well I just spent about an hour and a half playing with this but don't have a whole lot to show for it. First, for some reason, the ?Ctrl+Alt+F1" hotkey hardly ever works for me which makes experimenting with this very slow and time-consuming. The next major problem I've run into is that no combination of video card and monitor in displayconfig-gtk seems to work for me -- even after manually replacing the driver line with Driver "fglrx".
The process you describe seems perfectly logical to me. Do you have any idea which specific ATI card I should choose in displayconfig (I have a Radeon X1900?and a Samsung 213T monitor)? For the combination of two or three Radeon drivers that I managed to try in displayconfig and the Samsung 213T, I can't succeed in getting the GUI interface to start up?even after putting Driver "fglrx" into the file manually. Also, is there any explanation for why ?Ctrl+Alt+F1" just doesn't seem to work for me?
Just choose the correct monitor or a generic one. Don't try to choose a driver.
After you hit apply check xorg.conf file and replace all 'vesa' with 'fglrx' (there may be more than one)
To bypass Ctrl+Alt+F1 in the grub menu choose the 'safe mode' not the usual thing. I think this way you go straight to the console.
Well, I've not had much luck. I spent some time early this morning working on this again and, whether I use the appropriate Samsung driver or a generic monitor in display configuration, one of two things happens: either the display hangs on boot up or it reverts to very low resolution "plug-n-play." I have to do some real work now but it's rather exasperating to be apparently "so near and yet so far." I am attaching the monitor and driver information from one of my many attempts to make this work. Perhaps you will see something there that that I don't.
I suspect that what might be going on is that the main monitor stays cloned to the S-Video TV output or something like that. At least system/preferences/screen resolution always shows "cloned" as checked no matter how many times I uncheck and "apply" it.
The clip below is from the non-functioning Samsung 213T xorg.conf.
You can try purging the amdpcsdb file (it's usually in /etc/ati). The CCC has a bug that as soon as you change any display settings (like TV-out options) it screws up the displays.
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