Don't pin front buffer, kernel modesetting takes care of that now.

egl-compositor.c

@@ -819,7 +819,6 @@ create_frontbuffer(int fd, int *width, int *height, int *stride)
 	drmModeEncoder *encoder;
 	struct drm_mode_modeinfo *mode;
 	struct drm_i915_gem_create create;
-	struct drm_i915_gem_pin pin;
 	struct drm_gem_flink flink;
 	unsigned int fb_id;
 	int i, ret;
@@ -868,13 +867,6 @@ create_frontbuffer(int fd, int *width, int *height, int *stride)
 		return 0;
 	}
 
-	pin.handle = create.handle;
-	pin.alignment = 4096;
-	if (ioctl(fd, DRM_IOCTL_I915_GEM_PIN, &pin)) {
-		fprintf(stderr, "failed to pin buffer: %m\n");
-		return 0;
-	}
-
 	ret = drmModeAddFB(fd, mode->hdisplay, mode->vdisplay,
 			   32, 32, mode->hdisplay * 4, create.handle, &fb_id);
 	if (ret) {