Can't login to desktop environment after installaion

I installed Tumbleweed (16th April image, DVD) with KDE. I kept my /home directory from Arch.
In the login manager, after I insert my password the login manager just reloads instead of entering the desktop (tried all options, including icewm).
Xorg.1.log shows:
Fatal server error:
(EE) no screens found (EE)
(EE)
please consult the X.Org Foundation support…

Video card is a Radeon 6850.
Login to vt works fine.

Any idea what could be the issue?

Gave up and went back to Arch…