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[Dr4K4n <stefan@xxxxxxxxx>]

I'm having similar problems on my Dell XPS 13 9343 running 15.10 with 4.5.0-040500rc6-generic. 
I've ran 2 FullHD displays daisy-chained to the miniDP of the notebook, both monitors switched to DP 1.2. This lead to flickering. I since then dropped that configuration and run a single display set to DP 1.1 without flickering.
Still there are some problems. 
When watching a YouTube video fullscreen and changing the volume the screen freezes. The volume overlay doesn't appear, but the video seems to play along and the PC doesn't react to keypresses. 
The only way out is switching to a TTY (Ctrl+Alt+F1) and restarting lightdm.

Also since I've switched from 4.2.0-30-generic to 4.5.0-040500rc6-generic the messages in dmesg disappeared.
Please let me know when you need any more infos from me.

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https://bugs.launchpad.net/bugs/1488719

Title:
  dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control
  interrupt lied (SDE)!"

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On a recent intel NUC using i915 graphics, I get the following errors
  in dmesg:

  [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt
  lied (SDE)!

  There are two monitors connected to this box, one with mini-
  HDMI->HDMI, one with mini-DP->HDMI cable.

  Maybe related:

  https://bugs.freedesktop.org/show_bug.cgi?id=80896

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-generic 3.19.0.26.25
  ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.3
  Architecture: amd64
  Date: Wed Aug 26 10:07:31 2015
  InstallationDate: Installed on 2015-08-01 (24 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-26-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)

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