Comment 17 for bug 1543192

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M Grmn (mgrmn) wrote : Re: Xorg crashed with SIGABRT in OsAbort() ["no screens found"]

Might not be helpful. I edited my radeon.conf (which had "Detail") so I removed that.
Plus I had to chown {user}:{user} .Xauthority to be able to login (otherwise it would just kick me back to login screen) It helpt me logging in, but ofcourse not as it should.