desktop-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

John Morris, thank you for reporting this and helping make Ubuntu
better.

Could you please run the following command once from a terminal as it will automatically gather and attach updated debug information to this report:
apport-collect -p xorg 1535447

Please ensure you have the package xdiagnose installed, and that you
click the Yes button for attaching additional debugging information.

When reporting xorg related bugs in the future, please do so via the
above method. You can learn more about this functionality at
https://wiki.ubuntu.com/ReportingBugs.

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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

Title:
  Intel Graphics 4K Screen Tearing

Status in xorg package in Ubuntu:
  Incomplete

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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