Public bug reported:

Nouveau prevents booting on Optimus laptops (happened in recent kernels,
on other distro, the issue wasn't present as of 4.4).

Here is a transcript of the error:
nouveau 000:02:00.0: bus MMIO 00000000 FAULT at 022554
nouveau 000:02:00.0: priv: HUB0: 10ecc0 ffffffff 1e40822c

Then a bunch of NMI watchdog soft lockup messages (of the different CPU
stuck for 22s) and a message to echo something to
hung_task_timeout_secs.

Trying to use nomodeset, it takes forever to "boot", I see errors during
boot and when trying to load X.

Errors on the boot screen:
- tpm_crb MSFT0101:00: can't request region for resource [mem 
0xfed40080-0xfed40fff]
- systemd[1]: Failed to register Manager vtable: File exists
- systemd[1]: Failed to set-up API bus: File exists
- systemd[1]: Failed to register Manager vtable: File exists
- systemd[1]: Failed to set-up API bus: File exists

Yes, the systemd errors are present twice

Error on X start (and keyboard/mouse is unusable (mouse isn't even
displayed), I get a pop-up asking to adjust settings or something like
that that shows for a second or 2.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1698042

Title:
  Nouveau driver blocks boot (17.04) on Optimus laptop with 960m

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