I don't have a 4K monitor, but the following steps fixed video tearing
with Kubuntu 16.04 on my Intel i7-2600k CPU with integrated Intel HD
3000 Graphics.
Edit /etc/environment and add the following lines:
__GL_YIELD="USLEEP"
KWIN_TRIPLE_BUFFER=0
KWIN_USE_BUFFER_AGE=0
Save the file and reboot.
[Expired for xorg (Ubuntu) because there has been no activity for 60
days.]
** Changed in: xorg (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1535447
John Morris, to clarify, you upgraded the OS whose hardware is the
NUC5i5RYB (not some other computer with different parts) and this is
reproducible?
To advise, it's much easier to deal with different hardware that has
similar/same symptoms if you filed a new report with Ubuntu by ensuring you
Still not resolved as of today. I used another computer for testing
(Gigabyte motherboard and Nvidia 970) and also noticed the tearing started
appearing on it as well. I will try to upload a video.
This new computer was using Kubuntu 15.10 upgraded to 16.04 alpha 2
yesterday. I see the
apport information
** Tags added: apport-collected kubuntu third-party-packages vivid
** Description changed:
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,
** Tags added: latest-bios-0353
** Changed in: xorg (Ubuntu)
Importance: Low => Medium
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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John Morris, to see if this is already resolved, could you please test
http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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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
** Tags added: wily
** Package changed: ubuntu => xorg (Ubuntu)
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https://bugs.launchpad.net/bugs/1535447
Title:
Intel Graphics 4K Screen Tearing
To manage notifications about this
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
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