[Bug 244306] x11-servers/xorg-server: starting OpenGL application freezes the display (regression with 1.20.7)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244306

            Bug ID: 244306
           Summary: x11-servers/xorg-server: starting OpenGL application
                    freezes the display (regression with 1.20.7)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: philippe.michel7 at free.fr
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Since upgrading xorg-server to 1.20.7 (built and installed with default
settings), starting an OpenGL application seems to grab input events and freeze
before any window is realized.

This happens for instance with firefox and mpv and I was able check the
apparent relation to OpenGL with a self-maintained application that I can build
with or without GL support (freezes in the first case, works fine in the
latter).

The pointer moves normally but neither mouse or touchpad clicks or regular
keyboard inputs work (ctrl-alt-Fn does).

This is on a Lenovo X220 with FreeBSD 12.1 stable and relevant ports up to
date.

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