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(II) LoadModule: "vesa"
(WW) Warning, couldn't open module vesa
(II) UnloadModule: "vesa"
(EE) Failed to load module "vesa" (module does not exist, 0)
(II) LoadModule: "mouse"

Looks like it had trouble loading the vesa driver.  Should that work on
ppc?  Maybe try specifying it to use the framebuffer or other driver?

> I've seen the X debugging tips on the wiki, I will try these in the next
> few days. If it is a memory corruption issue what is going to be the
> quickest way to nail this? Would valgrind work with X?

I've not tried valgrind against X.  I would probably suggest the
standard approach for troubleshooting crash bugs - install debug symbols
for the server and drivers, and then obtain a full backtrace.  Then
examine pointers around the point of crash for endianness issues, not
being properly defined, etc.

When you get further along with the troubleshooting (like once you have
a backtrace), make sure to open a bug upstream with Xorg on it.

Bryce