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[David Abergel <davelargeuk@xxxxxxxxxxx>]

Done, see here:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1520751

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https://bugs.launchpad.net/bugs/1518976

Title:
  miniDisplay VGA adapter doesn't work after switching to 4.2 kernel

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After switching to Ubuntu 15.10, my miniDisplay port adapter doesn't work anymore, or in rare cases , it works, but it gives a maximum resolution of 1024x768 (whereas the monitor is 1920x1080).  
  Also, when I connect my iphone5 I cannot use the USB tethering anymore.
  If I boot with the older kernel, everything works as expected.

  Hardware info:
  system - dell xps 12 9q33
  minidisplay adapter - minidisplay to vga, made by apple
  iphone - iphone5 with latest ios (9.1)

  new (non-working) kernel = 4.2.0-18
  old (working) kernel = 3.19.0-33

  See also this post with another user having a similar problem:
  http://askubuntu.com/questions/695068/troubles-with-kernel-4-2-0-17-and-lan-vga-combo-port

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Mon Nov 23 15:20:49 2015
  DistUpgraded: 2015-11-18 18:03:13,739 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.4, 3.19.0-33-generic, x86_64: installed
   virtualbox, 5.0.4, 4.2.0-18-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:05e3]
  InstallationDate: Installed on 2015-06-17 (159 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. XPS 12-9Q33
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=93edf216-a846-46d5-8b12-878f088d2ec6 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-18 (4 days ago)
  dmi.bios.date: 03/03/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.asset.tag: 00000
  dmi.board.name: XPS 12-9Q33
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A08
  dmi.chassis.asset.tag: 00000
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd03/03/2015:svnDellInc.:pnXPS12-9Q33:pvrA08:rvnDellInc.:rnXPS12-9Q33:rvrA08:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 12-9Q33
  dmi.product.version: A08
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Mon Nov 23 15:19:11 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 957 
   vendor                                     LGD
  xserver.version: 2:1.17.2-1ubuntu9

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