grep -i rendering /var/log/Xorg.0.log does not give any output at all.
Looked at the log and found this, which might be interesting:
(II) LoadModule: "GLcore"
(II) Loading /usr/lib/xorg/modules/extensions/libGLcore.so
dlopen: /usr/lib/xorg/modules/extensions/libGLcore.so: undefined symbol: __glXLastContext
(EE) Failed to load /usr/lib/xorg/modules/extensions/libGLcore.so
grep -i rendering /var/log/Xorg.0.log does not give any output at all.
Looked at the log and found this, which might be interesting: xorg/modules/ extensions/ libGLcore. so xorg/modules/ extensions/ libGLcore. so: undefined symbol: __glXLastContext xorg/modules/ extensions/ libGLcore. so
(II) LoadModule: "GLcore"
(II) Loading /usr/lib/
dlopen: /usr/lib/
(EE) Failed to load /usr/lib/