This bug has been fixed in xserver upstream:
commit af88b43f9e604157b74270d609c08bdfa256a792 Author: Peter Hutterer <email address hidden> Date: Fri Apr 27 16:31:17 2012 +1000
dix: don't emulate scroll events for non-existing axes (#47281)
https://bugs.freedesktop.org/show_bug.cgi?id=47281
This bug has been fixed in xserver upstream:
commit af88b43f9e60415 7b74270d609c08b dfa256a792
Author: Peter Hutterer <email address hidden>
Date: Fri Apr 27 16:31:17 2012 +1000
dix: don't emulate scroll events for non-existing axes (#47281)
https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 47281