I investigated a bit and reverting the fix for issue #774938 (1) fixes the problem and my touch / stylus work correctly. So the regression is introduced by the following patch
503_fix_masked_transformed_valuators.patch Using a Lenovo X201T with Wacom touchscreen. Let me know if I can help in any other way. (1) https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/774938 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/799202 Title: wacom stylus jumps with latest xserver-xorg-core To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/799202/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
