http://bugs.winehq.org/show_bug.cgi?id=30057
--- Comment #31 from rocko rockorequin@hotmail.com 2012-03-08 21:16:33 CST --- Created attachment 39256 --> http://bugs.winehq.org/attachment.cgi?id=39256 patch to use raw motion event data instead of (buggy) X-transformed data
In case it helps anyone for now, the attached patch works around the problem for me by using the raw_events data as supplied by the mouse driver, instead of the X-accelerated value. (My quick test in xserver-xorg 1.10 showed that the two values are identical, so at least on my test system X doesn't transform the raw data.)
I don't know if it will break anything else, though.