Upstream drm-intel-next build resulted in working lightdm/screen ;
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2013-12-18-trusty/
Upstream drm-intel-next build resulted in working lightdm/screen ;
http:// kernel. ubuntu. com/~kernel- ppa/mainline/ drm-intel- nightly/ 2013-12- 18-trusty/