This fixes compositor-drm flickering on r600.
@ -65,6 +65,7 @@ drm_compositor_present(struct wlsc_compositor *ec)
GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER,
output->rbo[output->current]);
glFlush();
drmModePageFlip(c->base.drm.fd, output->crtc_id,
output->fb_id[output->current ^ 1],