You can't rule out the kernel if the bug happens on an upstream development kernel, since there might be commits backported to the stable queue that cause regressions.
Boot an older kernel to see if they work. ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/946311/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs