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[Launchpad Bug Tracker <1535447@xxxxxxxxxxxxxxxxxx>]

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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)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment wily
-- 
Intel Graphics 4K Screen Tearing
https://bugs.launchpad.net/bugs/1535447
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