I've done some tests too with faked mergedfb (replugging the monitor constantly is a major pita, btw), and this boils down to a simple initalization issue (at least with the mergedfb pageflip patch). Because it actually only happens the first time a 3d app is started, switching to a VT and back or scrolling in a virtual resolution fixes it and it will never appear again.Tested these on mergedfb and all works well. pageflipping still doesn't work with mergedfb.
Is that with Roland's separate patch for this applied as well?
yes. I doesn't work with various attempts I made as well.
I believe the problem is AdjustFrame is only called before dri initialization is finished, so directRendering is not enabled yet and thus the values in the sarea never written.
However, I tried fixing that by moving (also tried copying) the
pScrn->AdjustFrame(scrnIndex, pScrn->frameX0, pScrn->frameY0, 0);
to the end of RADEONScreenInit (3 lines before the end to be exact) and all I got was a SIGSEGV :-(. I can't see why it would segfault and can't debug it, since as always when Xorg crashes in initialization, I don't have any display left...
Roland
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