https://bugs.freedesktop.org/show_bug.cgi?id=86701
--- Comment #20 from Pekka Paalanen <ppaala...@gmail.com> --- (In reply to nerdopolis1 from comment #18) > Hi. I realized that the hang happens when I hover over an icon on the > desktop shell, and it tries to show a tooltip > > Output of weston running with WAYLAND_DEBUG=server > http://pastebin.com/0aQGBLFH Please don't put pastebin links here, they tend go bad over time. Much better to attach a file. > Only weston-desktop-shell hangs. If I get another client to run before > weston-desktop-shell hangs, that client stays running. *sigh* I wish we had a way to differentiate between clients in WAYLAND_DEBUG=server output... (there are several different clients interleaved in the trace, but I expected that) Ok, I see what happens. The tooltip is a sub-surface (due to migration to xdg-shell). Sub-surfaces start in synchronized mode, and the mode is never changed here. That means the frame callback cannot trigger, until the parent wl_surface is committed. Toytoolkit or weston-desktop-shell does not commit the parent before EGL starts waiting for the sub-surface's frame callback, which causes the hang. The immediate thing to investigate is whether EGL even gives the app a chance to commit the parent wl_surface (which also is a EGLSurface when you use cairo-egl). If the answer is yes, there is nothing wrong in Mesa, and the bug is in toytoolkit. Whether the answer is yes or no, this issue needs to be filed as a separate bug against Weston's toytoolkit. As fixing the toytoolkit is very low priority (and I would assume hardware accelerated GL to be broken the same way), the solution for end users is: do not configure Weston using --with-cairo=gl nor --with-cairo=glesv2; use the default --with-cairo=image. A quick'n'dirty fix would be to set the tooltip sub-surface to desync mode when it's created. That should avoid the hang, but it may be arguably a wrong solution. One must be able to use the synchronized mode even with EGL surfaces, so making sure it can work is essential. When filing a new bug, please copy my explanation and attach again the same protocol dump. -- You are receiving this mail because: You are the assignee for the bug.
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