[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

James Wright <james.wright at digital-chaos.com> changed:

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                 CC|                            |james.wright at digital-chaos.
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--- Comment #44 from James Wright <james.wright at digital-chaos.com> ---
Hit the same issue of OpenGl apps freezing on MacBookAir (Broadwell). 
Simply setting the LIBGL_DRI3_ENABLE flag fixed it for me without changing
anything else;

- Intel(R) Core(TM) i7-5650U CPU (HD Graphics 6000)
- FreeBSD 12.1-STABLE (r358483)
- drm-fbsd12.0-kmod-4.16.g20200221 (built from ports)
- mesa-dri-18.3.2_9 (pkg)
- mesa-libs-18.3.2_3 (pkg)
- xorg-server 1.20.7_1,1 (pkg)

- using modesetting-driver (configured vua /etc/X11/xorg.conf)
- added "export LIBGL_DRI3_ENABLE=1" to my ~/.zshrc

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