i've tried everything i can think of to fix these intermittent freezes and 
black screens, so i think i am also affected by this bug. sometimes my display 
and keyboard will freeze, but my mouse cursor can move (though i cannot use the 
buttons on it), sometimes it will freeze and go to the background color and 
input devices don't work, sometimes it will black out completely and input 
devices don't work, and oddly enough sometimes it even goes to "power saving 
mode" and input devices don't work.
i've tried both i686 and i386 kernel images resulting with the same problem. 
i've tried everything i could find in the forums and or the wiki to fix this 
problem via manual configuration of xorg.conf, including commenting out dri and 
glx and it results in the same problems and the ones suggested in this bug 
report. i also receive absolutely no errors in any log files.
everything is perfectly fine if i use the vesa driver, except the fact i cannot 
play games that need dri (which is a big deal to me).
i have tried using other distros and unfortunately windows to test and i am 
only affected by this problem in ubuntu. i've been using ubuntu since hoary and 
i'm not going to switch distros because i love where this project is headed and 
the goals set forth.
i hope the previous comments and the following information has been helpful, 
minus my own personal feelings/comments of course (please tell me to provide 
more if this is not enough).

system information: Linux <hostname> 2.6.20-15-386 #2 Sun Apr 15 07:34:00 UTC 
2007 i686 GNU/Linux
binary package: xserver-xorg-video-ati  (6.6.3-2ubuntu6)
excerpts from xorg.conf:
Section "Module"
        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "vbe"
EndSection

Section "Device"
        Identifier      "ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]"
        Driver          "ati"
        BusID           "PCI:1:0:0"
EndSection

"Section "Monitor"
        Identifier      "eView 17f3"
        Option          "DPMS"
        HorizSync       30-70
        VertRefresh     50-160
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]"
        Monitor         "eView 17f3"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
EndSection

Section "DRI"
        Mode    0666
EndSection

-- 
ATI Radeon 9200 / 9250 PCI black screen and console freeze with DRI
https://bugs.launchpad.net/bugs/114520
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