I believe this is due to touch records not ending properly when touches
are accepted before they physically end. Since all touches on a touchpad
must go to the same window set, once you send multitouch events to one
set of windows you cannot send multitouch events to any other windows
anymore because the first touches are still logically active in the
server.
A second fix for this issue is that the server should only be looking at
physically active touches, not logically active but physically ended
touches, when determining the window set to send touches to.
** Changed in: xorg-server (Ubuntu)
Status: New => In Progress
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => High
** Changed in: xorg-server (Ubuntu)
Milestone: None => ubuntu-12.04-beta-2
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https://bugs.launchpad.net/bugs/929408
Title:
X does not send multitouch touch end events properly
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