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Seriously?
I'm gonna testing with my pc!

Some updates here.
http://bbs.archlinux.org/viewtopic.php?pid=740784#p740784

I tested latest catalyst with xorg 1.7.6 but still the same error as you

I'm on Archlinux x86_64 kernel 2.6.33, sony vaio eb1z1e with ATI HD5650
:(

Don't give up.
What is your exact model?
On windows I was able to read and save the EDID, but still xorg doesn't work. Officially ati mobility HD5xxx is not supported by catalyst 10.3, so for some...