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[Brian Murray <brian@xxxxxxxxxx>]

** Tags added: wily

** Package changed: ubuntu => xorg (Ubuntu)

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https://bugs.launchpad.net/bugs/1535447

Title:
  Intel Graphics 4K Screen Tearing

Status in xorg package in Ubuntu:
  New

Bug description:
  On a fresh boot all works well, but after an indeterminate amount of
  time the screen starts tearing badly, most noticeably as a permanent
  vertical tear. Once this tearing starts, it affects everything
  (desktop, etc)  but is mostly visible in videos. The only way to get
  rid of the tear is to reboot.

   I do not know where this tearing is occurring, compositor? graphics
  driver?

  Hardware, Intel NUC5i5RYK (integrated graphics), LG 31MU97 DCI 4K
  monitor (4096x2160). Using a Mini DisplayPort to HDMI cable between
  the NUC and monitor.

  00:02.0 VGA compatible controller: Intel Corporation Broadwell-U
  Integrated Graphics (rev 09)

  Software, Kubuntu 15.04 I also see the same problem in 15.10, but the computer I took the video of has 15.04 installed.
  The screen resolution is set to 4096x2160.
   
  In my syslog, I also see tons of these error messages (I dont know if they are related to the tearing). The error message repeats multiple times, and then stops.

  [  668.879288] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master
  control interrupt lied (SDE)!

  I am hoping I can attach a video to this file which shows the tearing
  (5.7MB)

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