this is caused by enabling softpin in mesa, which is supported in kernel
4.5 and up but is still somewhat buggy as seen here.. we need these
commits backported to the kernel:

9125963a9494253fa5a29cc1b4169885d2be7042 drm/i915: Mark up GTT sizes as u64
6fc4e48f9ed46e9adff236a0c350074aafa3b7fa drm/i915: Compare user's 64b GTT 
offset even on 32b

but since 18.04.2 is about to be released, it's best to revert enabling
softpin in mesa, and enable it again for 18.04.3.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  Black screen on skylake after 18.0 => 18.2 update

Status in Mesa:
Status in linux package in Ubuntu:
Status in mesa package in Ubuntu:
Status in linux source package in Bionic:
Status in mesa source package in Bionic:
Status in linux source package in Cosmic:
Status in mesa source package in Cosmic:

Bug description:
  Several schools reported black screens after normally updating their
  Ubuntu boxes from 18.0.5-0ubuntu0~18.04.1 to 18.2.2-0ubuntu1~18.04.1.

  Downgrading mesa fixes the problem.

  lspci: 00:02.0 VGA compatible controller [0300]: Intel Corporation HD
  Graphics 530 [8086:1912] (rev 06)         Subsystem: ASUSTeK Computer
  Inc. HD Graphics 530 [1043:8694]    Kernel modules: i915

  Unfortunately I can't find a lot of useful information, here are some bits:
   * systemctl --failed says "gpu-manager" and "lightdm" have failed
   * Xorg.log is clean:
   * dmesg too:
   * It happens on lightdm/MATE, I don't know about Ubuntu GNOME.
   * If one runs `xinit` from ssh, it fails with:
  i965: Failed to submit batchbuffer: Invalid argument

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