[Wayland-bugs] [Bug 90434] weston's toytoolkit hangs on some versions of Mesa, on some hardware platforms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90434

            Bug ID: 90434
           Summary: weston's toytoolkit hangs on some versions of Mesa, on
                    some hardware platforms
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: weston
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: nerdopolis1 at verizon.net

Created attachment 115738
  --> https://bugs.freedesktop.org/attachment.cgi?id=115738&action=edit
running Weston with WAYLAND_DEBUG=server

>From Pekka Paalanen on https://bugs.freedesktop.org/show_bug.cgi?id=86701 :

"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."

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