Occasionally, the X server will fail to start. When this happens, the following error message appears in Xorg.0.log: (EE) Screen(s) found, but none have a usable configuration. I have seen this problem for a while now, with multiple versions of xorg-x11-drv-ati. (Currently, I am using xorg-x11-drv-ati-6.7.196-4.fc8.) This problem never occurs the very first time I launch the X server after a reboot; it only appears if a previously ran an X server at some point since the last reboot. It occurs only sporadically; it does not occur every time. I do not use gdm; I boot into runlevel 3 and run startx manually to start the server. Therefore, I do not know if this problem occurs when using gdm (in runlevel 5). I see this problem primarily on my laptop, which has a: 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R250 [Mobility FireGL 9000] (rev 01) I *think* I have seen it on other boxes (with different Radeon cards), but I am not completely sure about that. (The instances of encountering it on my laptop are the only ones that stick out in my mind.)
Created attachment 286021 [details] Xorg.0.log startup problem, with xorg.conf Here's the X server log from a failed attempt to start. In this attempt, the /etc/X11/xorg.conf file (as configured by system-config-display) is present.
Created attachment 286041 [details] Xorg.0.log startup problem, without xorg.conf Here's the X server log from another failed attempt to start. In this attempt, I removed the /etc/X11/xorg.conf file (as configured by system-config-display) and let the X server autodetect everything. However, the failure mode was the same.
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