Yes, I tried modesetting. I have to explicitly specify it via xorg.conf though.
Anyhow, it's terribly slow.
nitram informed me that the gallium driver was compiled without support for i915
For me, all this is quite puzzling. That's why I'm asking if it would make any sense to add support for i915.
Of course, the intel driver would be preferable for me if it will work in TC 8.