Thank you for the reply, Mr Salisbury.

I've installed the latest version 4.8.1 and checked the problem, it was
a bit rather worse. In unpluged HDMI case, it was fine as I expected,
but in plugged HDMI case, some errors occurred and OS couldn't properly
started up.

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

** Tags added: kernel-bug-exists-upstream

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  Build in display doesn't show a screen

Status in linux package in Ubuntu:

Bug description:
  I'm using UX21A Asus Zenbook Prime.

  When I connected HDMI socket to an external display and turn on the
  laptop, Ubuntu didn't show build in display even it said display was
  recognized and activated. It happened on Ubuntu 16.04 and Linux Mint
  18 Mint even when they were started as Live USB booting.

  When I switched off the build in display and reactivate it through
  Display Setting GUI, it started showing. But with xrandr command, it

  I unplugged HDMI and turn on the laptop and plug HDMI again after
  confirmed the BIOS Logo, the problem didn't show up.

  The situation I confirmed on several environment were all the same.

  It suppose to be caused by a problem which the laptop considers the
  external display as primary one.

  So currently, I unplug the HDMI when I start it up.

  I also asked in but it doesn't seem I could get the
  feedback. This is my first bug repport and please be kind.

  sudo lspci -vnvn > lspci-vnvn.log
  Ubuntu 4.4.0-38.57-generic 4.4.19
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  zenbook    1475 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=51f4543d-f960-4aea-8840-72631c112329
  InstallationDate: Installed on 2016-10-05 (4 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64(20160426.1)
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-38-generic.efi.signed 
root=UUID=cce15b3a-8ba8-40d2-a621-c8b542bb3484 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
   linux-restricted-modules-4.4.0-38-generic N/A
   linux-backports-modules-4.4.0-38-generic  N/A
   linux-firmware                            1.157.3
  Tags:  xenial
  Uname: Linux 4.4.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 11/14/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX21A.216
  dmi.board.asset.tag: ATN12345678901234567 UX21A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrUX21A.216:bd11/14/2012:svnASUSTeKCOMPUTERINC.:pnUX21A:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX21A:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: UX21A
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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