Bug#406030: xserver-xorg-video-i810: No direct rendering with i810?
So, the correct solution here is probably to just uninstall fglrx (you
probably don't need anyway if you have a i810 board?).
You are 100% right there.
1. It actually was fglrx-driver breaking it,
2. a fglrx-driver is not needed with an i810 chip and
3. I don't know why the fglrx-driver package was installed anyways.
I wonder, if the problem could have been avoided somehow with different
dependencies or different packages - when I started looking what was
wrong, I didn't really have a clue what caused the problem.
Thank you for the help,