As a lemon, you'll have to give me a better clue as to how to get into and edit the config file. I can traverse to the correct dir, but how do i call up an editor to change the file (bearing in mind the best I can manage atm is a text login screen). Tried all combinations of Ctrl+Alt+F keys with no joy. :-((
I've had a better look at the errors and they are as follows;
(EE) Radeon(0); No valid mode found for this DFP/LCD (EE) Screen(s) found, but none have a usable configuration. Noscreens found
what type of Radeon do u have, perhaps someone on list may have the same one and can send u the correct XF86Config-4 file for you to crib from? I don't have a radeon at all unfortunately!
try going to that directory and typing: emacs XF86Config-4
(if u press tab after typing a filname, it should autocomplete btw)
if not, try nano XF86Config-4 or vim XF86... etc or vi XF86...
(I'd read some help text from somewhere on vi if u have to resort to that, as it's not the easiest to use if you don't know what ur doing)
hope that helps
Ricardo