I'm attaching a more detailed kernel log (using drm.debug=999 at boot) of what's happening when using xrandr, in case it could be useful.
** Attachment added: "detailed-kernel-log.txt" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/946311/+attachment/3065143/+files/detailed-kernel-log.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/946311 Title: only external screen is working with asus zenbook ux31e [eDP1] To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/946311/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
