Hello,
I found this report [Bug 10132] New: dri doesn't work on second head (r128) on 
the archives, and it seems to be also my problem (radeon 7000 and mga card). I 
would risk a statement that it would hit any system with 2 drivers that use 
different options. It is quite strange that there is so little reports about 
this.

I have tried to find out where the problem is, but I am not a dri developer and 
it was ... hard. I simply have no idea why both drivers get option list form 
first screen. Do You think that I have any chance to find the problem? I can 
spend some time working on it but please point me to right direction. Where 
should I start looking? 
I am not sure if I am right but it seems that drivers get theirs options from 
xorg.conf and then form drirc file. I tried to play with options in drirc, but 
this not change anything. In my case MGA drivers constantly gets options 
defined in xorg.conf for radeon and fails. But how this options were send to 
it? drirc files are readed when opengl application starts and opens drivers but 
what is going on with the list from xorg.conf?

Regrds,
Michael


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