On Wed, Nov 14, 2012 at 03:37:05PM -0200, Daniel d'Andrada wrote: > 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).
just fyi, I am keeping an eye on this bug, I've just been busy with other stuff for the last couple of days. I'm pretty sure this is also influenced by this bug here: http://bugs.freedesktop.org/show_bug.cgi?id=56557 which causes some issues with pointer emulation on the root window, so if you can test with these 3 patches + the one I just sent out that'd be quite appreciated. http://lists.x.org/archives/xorg-devel/2012-November/034480.html Cheers, Peter _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
