FYI this is also happening for me, LTS 16.04.3 + HWE (kernel and xorg pkgs),
Thinkpad x270 w/ Integrated Graphics Chipset: Intel(R) HD Graphics 620.

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  Blank screen when starting X after upgrading from 4.10 to 4.13.0-26

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  In Progress

Bug description:
  I'm following the HWE kernels in Ubuntu 16.04, so my kernel was
  upgraded today from 4.10.0-42 to 4.13.0-26. After rebooting, the
  splash screen and disk encryption passphrase prompt showed correctly,
  but when X started, the screen went blank. Logs showed everything
  running as normal despite the blank screen. Rebooting with the
  "nomodeset" kernel parameter fixed the issue but is not suitable as a
  permanent workaround since it disables my external monitor. Rebooting
  back into 4.10 also fixed the issue.

  I am using a ThinkPad X240 laptop, current HWE packages. I tried
  both intel and fbdev X drivers, both gave a blank screen.

  lsb_release: Ubuntu 16.04.3 LTS

  dpkg-query -W:

  xserver-xorg-hwe-16.04        1:7.7+16ubuntu3~16.04.1
  xserver-xorg-video-intel-hwe-16.04    2:2.99.917+git20170309-0ubuntu1~16.04.1
  xserver-xorg-video-fbdev-hwe-16.04    1:0.4.4-1build6~16.04.1

  In Xorg.0.log with fbdev, I saw:

  [    23.646] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument

  repeated 239 times.

  Typical kernel messages attached (from kern.log, reformatted to look
  like dmesg).

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