Try to look further in the log, you should see that GLcore gets loaded later, together with glx.:
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions/libglx.so
(II) Module glx: vendor="X.Org Foundation"
compiled for 7.0.0, module version = 1.0.0
ABI class: X.Org Server Extension, version 0.2
(II) Loading sub module "GLcore"
(II) LoadModule: "GLcore"
(II) Loading /usr/lib/xorg/modules/extensions/libGLcore.so
(II) Module GLcore: vendor="X.Org Foundation"
compiled for 7.0.0, module version = 1.0.0
ABI class: X.Org Server Extension, version 0.2
(II) Loading extension GLX
Try to look further in the log, you should see that GLcore gets loaded later, together with glx.:
(II) LoadModule: "glx" xorg/modules/ extensions/ libglx. so xorg/modules/ extensions/ libGLcore. so
(II) Loading /usr/lib/
(II) Module glx: vendor="X.Org Foundation"
compiled for 7.0.0, module version = 1.0.0
ABI class: X.Org Server Extension, version 0.2
(II) Loading sub module "GLcore"
(II) LoadModule: "GLcore"
(II) Loading /usr/lib/
(II) Module GLcore: vendor="X.Org Foundation"
compiled for 7.0.0, module version = 1.0.0
ABI class: X.Org Server Extension, version 0.2
(II) Loading extension GLX
Does Xorg's log contain anything about "drm" ?