Tested three different graphics configurations: (all are at 1024x768) 16 Bit, DRI = No. 16 Bit, DRI = Yes. 24 Bit. ***************** 16 Bit, DRI = No. ***************** Open up a terminal session The sequence: Took me to the text login screen. Brought me back to the terminal session I left. During the terminal session I ran glxgears and an odd thing happened when I exited the program. Notice the last line here: ------------------------------------- [root@linmaster log]# glxgears 771 frames in 5.0 seconds = 154.200 FPS 600 frames in 5.0 seconds = 120.000 FPS 720 frames in 5.0 seconds = 144.000 FPS 600 frames in 5.0 seconds = 120.000 FPS 600 frames in 5.0 seconds = 120.000 FPS 720 frames in 5.0 seconds = 144.000 FPS 600 frames in 5.0 seconds = 120.000 FPS 600 frames in 5.0 seconds = 120.000 FPS 600 frames in 5.0 seconds = 120.000 FPS X connection to :0.0 broken (explicit kill or server shutdown). --------------------------------------- The attachment in comment # contains; xorg.conf, Xorg.0.log, and dmesg ****************** 16 Bit, DRI = Yes. ****************** This is my normal setup mode. I have booted this computer 100's of times into this mode without problem until today (after the 24 Bit test below) Open up a terminal session The sequence: Took me to the text login screen. Caused the computer to lock up without re-displaying the graphical login screen. I had to reboot. The attachment in comment # contains; xorg.conf, Xorg.0.log, and dmesg ****** 24 Bit ****** This was a disaster. All the nastiness described in https://freedesktop.org/bugzilla/show_bug.cgi?id=1232 occurred;i.e. the slowness and refresh problems. The attachment in comment # contains; xorg.conf, Xorg.0.log, and dmesg What's also puzzling, is that even the 16Bit, DRI=Yes mode above was a problem after running this configuration (slowness and refresh problems). I finally had to do a cold boot in order to restore things to working condition. (Mounting the root partition on another OS (FC1) and copying the 16 Bit, DRI=Yes Xorg.conf file into place and then reboot into Fedora Core 3 Also of note is the fact that I am certain that I've run 24 Bit graphics on an earlier version of Xorg-X11 software without problems. If it will be of use to troubleshoot this problem I'll be happy to roll back to earlier versions of Xorg-X11* software.