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[Bug 1520751] Re: Kernel 4.2 does not detect external monitor


David Abergel, the next step is to fully reverse commit bisect from
kernel 4.2 to 4.3 in order to identify the last bad commit, followed
immediately by the first good one. Once this commit has been identified,
then it may be reviewed as a candidate for backporting into your
release. Could you please do this following

Please note, finding adjacent kernel versions is not fully commit

Thank you for your understanding.

Helpful bug reporting tips:

** Changed in: linux (Ubuntu)
   Importance: Low => Medium

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

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  Kernel 4.2 does not detect external monitor

Status in linux package in Ubuntu:

Bug description:
  On xubuntu 15.10.

  Kernel version 4.2.0-18-generic x86_64 does not detect an external
  monitor when it is connected via the minidisplay port. Using xrandr, I
  can force output to the monitor, but the maximum resolution is
  1024x768 (I think). Hardware is a Dell XPS 13.

  Upgrading to the mainline kernel in the 4.3 version stream eliminates
  the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  NonfreeKernelModules: openafs
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
   /dev/snd/controlC1:  dabergel   1783 F.... pulseaudio
   /dev/snd/controlC0:  dabergel   1783 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Sat Nov 28 10:02:37 2015
  HibernationDevice: RESUME=UUID=703c29b7-4b30-449e-8da6-1f926373c84b
  InstallationDate: Installed on 2015-05-04 (207 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=1658dd66-913e-4ad3-8766-e821498ff4e7 ro nosmap quiet splash vt.handoff=7
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.2
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-31 (27 days ago)
  dmi.bios.date: 03/25/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0F5KF3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0F5KF3:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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