Ubuntu
xorg-server package

  1. Bug #1307701
  2. Comment #41

Comment 41 for bug 1307701

Revision history for this message
In , Bugs-i (bugs-i) wrote :

Created attachment 98694
xorg-integration-tests testcase try 2

Ok so I've finally isolated the problem. The problem is the XIGrabDevice on the slave pointer, which is only removed after the touch ends. When this happens the ButtonRelease call for pointer emulation is never generated, leading to the 'stuck button' bug.

Modifying qt to listen to touch events on the master fixes it and removes the need for the XIGrabDevice call. The grab was originally done to prevent pointer emulation events, but these won't get generated when we listen for touch events on the master, solving both problems.

But this is still a bug in xorg-server, regardless. :)