Comment 2 for bug 1818972

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Daniel van Vugt (vanvugt) wrote : Re: [regression] gnome-shell visible latency is very high with Xorg 2:1.20.4-1ubuntu1

Found the problem in mutter:
CLUTTER_FEATURE_SWAP_EVENTS is missing because
COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT is missing because
cogl-winsys-glx isn't being used because
xorg 2:1.20.4-1ubuntu1 is missing/has broken GLX support...

$ glxinfo
name of display: :4
Error: couldn't find RGB GLX visual or fbconfig