Bug#904465: What fixed it for me, for now.

ia glx module gets xorg-server 1.20.0-3 (and probably earlier) working again. I don't know where the update of xserver-xorg-core comes into play by changing the default glx module but no other update seemed to have caused this. Thank You for your time. -Willi Junga signature.asc Description: OpenPGP digital signature

Bug#904465: Upgrading xserver-xorg-core breaks OpenGL?

regards, - -Willi Junga -BEGIN PGP SIGNATURE- iQIzBAEBCAAdFiEE4Y9gQbd27eJFNPMJX9KpUGvoUHcFAltXN5YACgkQX9KpUGvo UHfP6BAAvn6p4n82ZuLPKV5kn6j3WUnXToq3PfR3ZEvpOcUgNmpQYmUVsJDC1e0O Q5pCgnm8dx0JtcI4OhEihVynJjXmxJxpJAJMPcX2E/s2PYyDzhJvWbG4h1IRvm9G 1yv2eou9vou13d