http://bugs.winehq.org/show_bug.cgi?id=6971
--- Comment #219 from Forest Hale lordhavoc@ghdigital.com 2009-01-17 22:30:12 --- (In reply to comment #218)
The DGA won't help - it covers exclusive mode only. And is currently disabled on most distros.
I just stated that DGA could be used for non-exclusive mode by having the wine code warp the mouse cursor around according to the relative motion detected via DGA, it's a hack but it at least behaves correctly in all cases (the mouse is already clipped to the window by ClipCursor, this just gives wine full control of the cursor behavior while it is locked in that window).
But this all depends on whether anyone is interested in contributing such a patch.
As for it being disabled - to my knowledge it is enabled and working on all distributions if you use the mouse driver in xorg, but all distributions have had very hit-or-miss compatibility on evdev until recently.
This is why I suggested it be a checkbox - it either works or it doesn't (and the user can make it work with xorg.conf changes in my experience), so it's a useful workaround feature until Input2 is out.