ACK! I hit the hard-stop(total freeze) about 10-mins after submitting comment #7.
I rebooted into single-user-mode(runlevel 1) and uninstalled the upstream-drm-nightly kernel and am running on stock: chris@CKR-DKM:~$ uname -a Linux CKR-DKM 3.19.0-30-generic #34-Ubuntu SMP Fri Oct 2 22:08:41 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux again. FWIW: The trigger for the freeze might have been my opening multiple background tabs in chromnium using the middle-click-wheel on my mouse while looking into other information. I launched about 12-15 background tabs with about one second between each click. The freeze occurred after about 10-seconds of reading the first tab in sequence. Please advise when able. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1503731 Title: 15.04 freezes totally using Intel(i915) on BayTrail / ValleyView SoC(J2900 CPU) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1503731/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs