I was able to work around this bug on a 1.25Ghz eMac (USB2.0) with
onboard ATI Radeon 9200 under intrepid by adding the option "monitor-
DVI-0" to the device section of xorg.conf as documented here:
http://ubuntuforums.org/showthread.php?t=964032&page=3

To find out the name of the connection, boot ubuntu and let the screen
flicker then go black. Hit CTRL+ALT+F1 for a terminal and login. Use the
command "xrandr --verbose -q -d :0" and look for the header line of each
connector:

DVI-1 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1280x960+0+0 (0x4f) normal (normal left inverted right x axis y 
axis) 0mm x 0mm
S-video disconnected (normal left inverted right x axis y axis)

In this example it is "monitor-DVI-0" but is may be "monitor-DVI-1",
"monitor-VGA-0", "monitor-S-video" or something else depending on your
setup.

You then need to add a line to the "Device" section of xorg.conf for
your video card that points this connector to the "Identifier" you used
in the "Monitor" section of xorg.conf.

Option     "monitor-DVI-0"     "Configured Monitor"

-- 
[PPC] xorg fails with ati driver on Apple ppc
https://bugs.launchpad.net/bugs/93509
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