Hi, I'm not saying that it isn't related to _NET_WM_FRAME_DRAWN, but I don't think it should be for the following reasons:
- I would expect it to affect only software rendering, since with ES2 the rendering is handled by OpenGL and does not rely on GDK/GTK for rendering. - Disabling frame synchronization with gdk_x11_window_set_frame_sync_enabled() does not change the behavior. - Popups are override-redirect windows, so theoretically the window manager/compositor should not manage or otherwise interfere with them. -- Thiago Em ter., 18 de ago. de 2026 às 13:57, Martin Fox <[email protected]> escreveu: > I was able to reproduce this bug while using xtrace and confirmed that the > _NET_WM_FRAME_DRAWN message is not being sent. BTW it takes a lot longer to > reproduce this with xtrace. > > I’ve written a standalone GTK 3.0 application that demonstrates the > problem. I’ll attach it to the JBS ticket. > > So far I’ve only been able to reproduce this on Ubuntu 24 LTS with Xorg as > the backend. When I run Ubuntu 24 under Wayland I can’t get it to > reproduce. In Ubuntu 26 Wayland is the only option so I can’t reproduce the > bug there, either. > > The frame lock freezing and thawing is internal to GDK and looking at the > sources I don’t see any way to thaw it externally. > > Martin > > > On Aug 16, 2026, at 3:19 PM, Thiago Milczarek Sayão < > [email protected]> wrote: > > > > The issue cannot be reproduced when running with GDK_SYNCHRONIZE=1 (not > > recommended; used for testing purposes only). > > > > I've tried a few workarounds, but so far, none of them have been > successful. > > > > > > > > Em dom., 16 de ago. de 2026 às 02:41, Christopher Schnick < > > [email protected]> escreveu: > > > >> Would there be any way to guard against the bug from the JavaFX-side so > >> that an invisible popup won't be shown when it happens? Doesn't have to > >> be pretty, just to avoid the most glaring issue > >> > >> On 16/08/2026 02:56, Thiago Milczarek Sayão wrote: > >>> Hi, > >>> > >>> It seems that this is a bug in Mutter. > >>> > >>> I tried disabling frame synchronization using > >>> gdk_x11_window_set_frame_sync_enabled(), but the issue still occurs. > >>> > >>> I also tried forcing an Expose event after the popup was mapped, but > that > >>> did not solve the problem either. > >>> > >>> The popup window is mapped correctly, but occasionally it is not > rendered > >>> on screen. > >>> > >>> > >>> See (the video shows one run, but i did many with the same result): > >>> > >>> youtube.com/watch?v=1LB2OLrYex8&feature=youtu.be > >>> > >>> Xephyr :100 > >>> > >>> DISPLAY=:100 java @/home/tsayao/jfx/build/run.args AutoPopupTest.java > >>> > >>> Test 1: > >>> No window manager - bug does not happen > >>> > >>> Test 2: > >>> kwin - bug does not happen > >>> DISPLAY=:100 dbus-run-session kwin_x11 --replace > >>> > >>> Test 3: > >>> mutter - bug happens > >>> DISPLAY=:100 dbus-run-session -- mutter --x11 > >>> > >>> -- Thiago. > >>> > >>> > >>> > >>> Em ter., 11 de ago. de 2026 às 20:18, Martin Fox < > [email protected] > >>> > >>> escreveu: > >>> > >>>> For those of you who haven’t looked at the bug report, it has to do > with > >>>> GDK expecting the windowing system to send it a _NET_WM_FRAME_DRAWN > >> message > >>>> but the message never arrives. If this is something you have any > >> experience > >>>> with feel free to jump in and investigate (because I’m at a loss). > >>>> > >>>> It looks like we’re not the only one seeing this. I ran across a > thread > >>>> detailing how GVim sometimes freezes (vim/vim repository on GitHub, > >> issue > >>>> #12671) and they also concluded it was due to GDK not receiving this > >>>> message. The Discourse discussion contains more information (link in > the > >>>> JBS ticket). They were not able to resolve the problem. > >>>> > >>>> Martin > >>>> > >>>>> On Aug 10, 2026, at 11:59 AM, Andy Goryachev < > >> [email protected]> > >>>> wrote: > >>>>> I think this scenario warrants bumping the issue to P3. > >>>>> > >>>>> -andy > >>>>> > >>>>> > >>>>> From: PavelTurk <[email protected]> > >>>>> Date: Sunday, August 9, 2026 at 23:55 > >>>>> To: [email protected] <[email protected]> > >>>>> Subject: [External] : Using JavaFX on Linux can be dangerous > >>>>> > >>>>> Hi everyone, > >>>>> > >>>>> I would like to warn everyone and provide some feedback regarding the > >>>>> use of JavaFX on Linux. We developed a small application and gave it > to > >>>>> a small number of the customer’s employees for testing. The > application > >>>>> was tested on both Linux and Windows. > >>>>> > >>>>> We encountered serious problems on Linux. Due to bug JDK-8371781, > popup > >>>>> windows are not displayed to the user, but they are still present in > >> the > >>>>> scene. As a result, a user can click on elements in these popups > >> without > >>>>> being able to see them, potentially triggering actions that they > >>>>> absolutely should not be able to perform. > >>>>> > >>>>> Therefore, I decided to bring this issue to the attention of the > JavaFX > >>>>> developers and warn others about the potential safety implications of > >>>>> using JavaFX on Linux. > >>>>> > >>>>> Best regards, Pavel > >>>> > >> > >
