Hey, I've just upgraded from bionic to cosmic and I seem to be hit by
this. Perhaps. What I experience is that while I have an encrypted root,
with the cosmic kernel I don't get a chance to input my passphrase.

Anything I can do to help debug this? I'm a web developer. I can use git
bisect.

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https://bugs.launchpad.net/bugs/1783957

Title:
  Nouveau crashes at login with Kernel 4.15.0-29 on MacBook Air, so no
  login screen in a normal sequence

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Bionic:
  Triaged
Status in linux source package in Cosmic:
  Triaged

Bug description:
  I have a MacBook Air laptop which is running Linux (Kubuntu 16.04.5
  LTS) with NVidia Graphics Card, KDE, Xorg, SDDM, and so on... Clean
  and natural install, no funky custom kernel or drivers or anything...

  Everything worked fine (with the 4.13.* kernel) until I've upgraded
  all my packages (which included the "wonderful" 4.15.0-29 kernel,
  which broke my system).

  Now, everytime I try to boot normally, it asks me for my disk password (I 
have an encrypted LVM) and after that, guess what ?: blank screen. The login 
screen does not appear.
  I can switch the Terminals with Ctrl+Alt+Fx, however.

  However, the same kernel, if I boot it in recovery mode and then I
  select "Resume", the login screen appears, but it lags a little bit...

  Needless to say, if I boot the older kernel (4.13), everything works
  perfectly.

  I dug up some logs and found something like "sddm-greeter"
  segmentation fault in nouveau_dri.so or something like this.

  So, it looks like the new kernel doesn't quite seem to look eye-to-eye
  with nouveau drivers...

  And no, I don't want the NVidia proprietary drivers because I get
  along just perfectly with Nouveau on other machines, and I don't want
  to reinstall nvidia drivers everytime I'm upgrading the kernel.

  And yes, I already have "haveged" installed, to provide sufficient
  entropy (I saw that the possible lack of entropy might be a problem in
  some cases)...

  If I boot in recovery mode and then select "resume", everything works.

  So, what is going on ?

  Any help would be appreciated...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Fri Jul 27 10:40:31 2018
  InstallationDate: Installed on 2018-07-04 (22 days ago)
  InstallationMedia: Kubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
(20180228)
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)

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