http://bugs.winehq.org/show_bug.cgi?id=30057
--- Comment #34 from rocko rockorequin@hotmail.com 2012-03-14 20:41:06 CDT --- @John P Sims: do you have 'Capture mouse in full screen' set and have you built wine with xinput2 support? If you haven't done both, wine uses xinput1 instead of xinput2 and the mouse works properly - it's just not constrained within the window.
@Loris Zinsou: have you seen any other documentation that confirms what Peter Hutterer said, ie that the validators are supposed to return absolute coords? If so, it would suggest that wine needs to change to either use the raw motion inputs or to calculate the delta from the validators when using xinput2 >= 2.1.
@anyone: why is this bug status marked as resolved upstream? As far as I can tell, it isn't resolved upstream, and based on what Peter H said, it won't be.