I wrote an email to the Xorg developers, and I had this answer (I tried to reinstall 4.3 and it works fine with the "iBookHacks" option. I had this answer:
Code:
the ibookhacks option must be some openbsd
specific patch. If you can point me to the patch I can look at
incorporating it into the upstream radeon driver.
anyone knows how to get it?
Also, I even tried to install 4.4 -current, but it does not even boot, it hangs while checking the hardware before getting to "boot>"