I think we should forward this bug report upstream. For this, we would
need you to test latest Jaunty (for instance running a live CD) and
attach new logs. Get a PowerPC live CD here:
http://cdimage.ubuntu.com/ports/daily-live/current/

At the CD boot menu, add "text" to the boot options:
https://help.ubuntu.com/community/BootParameters

The CD will now boot but not start X. At the text prompt, run "startx"
to start X with the default driver.

Afterwards, copy the corresponding X log to the current directory:
 cp /var/log/Xorg.0.log .

Now edit xorg.conf to make X use the "vesa" (failsafe) driver:
 nano /etc/X11/xorg.conf
and change the Device section to look like this:

Section "Device"
      Identifier      "Configured Video Device"
      Driver          "vesa"
EndSection

Then start X which should give you a desktop session, although with low 
resolution:
 startx

>From here, attach the xrandr.log and Xorg.0.log (which are in the Home
Folder) to this bug report. If for some reason you can not log into
launchpad from the live CD (network problems etc), you can also copy the
files to a USB drive now and attach them from another computer or
session later.

See also https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen

-- 
[r128] Rage 128: Unsuitable videomode autoselected
https://bugs.launchpad.net/bugs/148117
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