Hi all, I've been investigating an issue where xserver simply stops sending ButtonPress and ButtonRelease events, out of touch events, to a window. I've spent already quite a few days studying the issue, looking at the pointer grabbing + pointer emulation logic, and although progress has been made, I fear reaching insanity before finally cracking it. :)
I've a good amount of information in a log, so my hope is that some expert in (or author of) the touch input code (e.g. Peter Hutterer) might be able to shed some light on the issue without much effort. Here's is the situation: The setup is a touchscreen laptop running Ubuntu. I just repeatedly tap on the top-most icon (the one which has the Ubuntu logo) of Ubuntu's launcher. Those taps alternately open and close the dash (a fullscreen window that shows icons for applications, media and other files). At some point those taps stop having any effect. I.e., the launcher no longer gets ButtonPress and ButtonRelease events out of them. And here's is the corresponding log (from bug 56578): https://bugs.freedesktop.org/attachment.cgi?id=70064 >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). - Daniel _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
