..because -extra has the i915 kernel driver

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  Broadwell-U  screen stopped working after 14.04 update

Status in xserver-xorg-video-intel package in Ubuntu:

Bug description:
  I am on Ubuntu 14.04.5 LTS
  I recently updated my laptop to  vmlinuz-4.4.0-37-generic

  After rebooting, I lost my external Monitor (Display application does not 
even detect it )
  This is my main monitor and is connected via HDMI.

  Ive had error messages with Ubuntu an the external screen on Intel
  "Broadwell-U" but this is the first time it cut me off totally.

  Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
  VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics 
(rev 09)

  lshw -c video
    *-display UNCLAIMED     
         description: VGA compatible controller
         product: Broadwell-U Integrated Graphics
         vendor: Intel Corporation
         physical id: 2
         bus info: pci@0000:00:02.0
         version: 09
         width: 64 bits
         clock: 33MHz
         capabilities: msi pm vga_controller bus_master cap_list
         configuration: latency=0
         resources: memory:f0000000-f0ffffff memory:e0000000-efffffff 

  cat /var/log/Xorg.0.log |grep EE
  [    27.266] (EE) No devices detected.
  [    27.270] (EE) open /dev/dri/card0: No such file or directory
  [    27.270] (EE) open /dev/dri/card0: No such file or directory
  [    27.270] (EE) Screen 0 deleted because of no matching config section.
  [    27.335] (EE) AIGLX: reverting to software rendering

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