I can confirm the big on my powerbook 12 1.5 ghz, nvida 5200 Go running ubuntu 
edgy updated as of today. I am pretty sure the problem is caused by the usage 
of open firmware (ofonly) framebuffer instead of rivafb framebuffer. My 
yaboot.conf appends the option video=rivafb to the kernel, but rivafb is 
compiled as an external module in the default kernel: 
~# modprobe -l |grep rivafb
/lib/modules/2.6.17-10-powerpc/kernel/drivers/video/riva/rivafb.ko
So I think this module must be put into the initrd so it can be loaded upon 
booting or otherwise rivafb must be compiled statically into the kernel.

-- 
USplash looks corrupted on PPC
https://launchpad.net/bugs/21478

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