Comment 13 for bug 1068994
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#13 |
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73416ba
(Get the code!)
I just repeatedly tap on the top-most icon (the one which has the Ubuntu logo) of Ubuntu's launcher in a touchscreen. Those taps alternately open and close the dash (a fullscreen window that shows icons for applications, media and other files). Eventually those taps stop having any effect. I.e., the launcher no longer gets ButtonPress and ButtonRelease events out of them.
I've added a wealth of logging (see xorg.log attachment) to try to understand what's happening on the server. From looking at it could see the following:
From touches 2 to 26, launcher is the first window in the list of listeners. From touch 27 onwards, the root window is the first one. Problem is, from touch 27 onwards, xserver fails to pass the touch ownership down to the launcher window because there's always an older pointer-emulated touch (touch 26) lying around which it apparently can't get rid of (i.e. properly process).