Hi,

just a guess, but perhaps the graphics card needs more memory in dual head mode, therefore being unable to use DRI?

cheerio, Peter

Georg Holzmann wrote:

Hallo Frank!

Thanks for the fast answer!

...

Also you need to enable DRI in /etc/X11/XF86Config[-4] like:

Ah - this is the problem. Yesterday I loaded my XF86Config-4 for dual screen and so I have this bad performance. But I don't understand why, I have the same settings (only an additional monitor:) - maybe I must specify something special for dual screen (xinerama) ?

Here are my XF86Configs: http://grh.mur.at/XF86Config-4.dual_head http://grh.mur.at/XF86Config-4.single_head

with the single_head DRI works ...

LG Georg