I've hit this problem as well on a G5 with Radeon, in Feisty final.
Driver package version is 6.6.3-2ubuntu6.

With Ben Herrenschmidt's help, tracked the problem down to an Ubuntu
patch which adds some VBE based DDC probing code to the driver as a
fallback.  That gets triggered on powerpc, and VBE attempts to load
int10 which fails horribly, hanging the machine.

Attached patch fixes the problem by disabling the vbe code on powerpc,
though I don't know that it's really a correct fix.

** Attachment added: "Disable VBE probing on powerpc"
   http://librarian.launchpad.net/7389400/109_radeon_no_vbe_on_powerpc

-- 
xorg fails with ati driver with feisty on Apple ppc (post herd5 update)
https://bugs.launchpad.net/bugs/93509
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