No experience with that card although googled around a bit.
r128 not working?
if you are using an explicit xorg configuration i think you must as:
https://www.libreoffice.org/bugzilla...g.cgi?id=72974.. once you generate one please post it.
Might be of some interest (the second for an idea of how your xorg.conf should look):
http://vanilla.slitaz.org/index.php?...not-radeons/p1
http://forums.debian.net/viewtopic.php?f=6&t=106834
happy new year.. as i probably will not follow up here until the new year (if needed)
edit: i posted after i noticed guub or your response
you have them installed if you installed the entire x directory. to check `ls /var/log/packages/ | grep xf86`