http://bugs.winehq.org/show_bug.cgi?id=11846
--- Comment #59 from Kaetemi kaetemi@gmail.com 2012-03-24 18:57:21 CDT --- 3. Random pen movement is stopped by not forwarding events where (gMsgPacket.pkOrientation.orAltitude < 0) in wintab.c.
Pressure works fine with above fixes.