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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

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug latest-bios-a08 ubuntu wily
-- 
miniDisplay VGA adapter doesn't work after switching to 4.2 kernel
https://bugs.launchpad.net/bugs/1518976
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