Screen tearing in Portrait mode on Ubuntu 18.04 LTS.

[BlastDigitalSignage]

Describe the bug
A scheduled MP4 Video playing within Xibo shows pretty bad screen tearing, but only when in portrait mode. When the exact same file plays in landscape mode, the screen tearing is gone. Interestingly, when we manually play the same file via MPV in portrait mode, there is no screen tearing, it only happens within Xibo in portrait mode.

Also, the problem seems to be only present on our displays with Intel UHD 600 Graphics. Our displays with Intel HD 500 Graphics seem to be unaffected.

To Reproduce

1. Schedule display (to a device with Intel 500 HD graphics) to play a full hd mp4 file.
2. Configure the display on the client side to display everything in portrait mode.
3. Observe the bad screen tearing with fast moving images.

Expected behavior
The MP4 file plays out smoothly without screen tearing.

Environment (please complete the following information):

• Linux Disto: [Ubuntu 18.04 LTS]
• Linux Desktop Environment: [Gnome]
• How the player was launched: [snap, stable channel]
• Player Version: [1.8-R6]
• Graphics: Intel UHD 600

[BlastDigitalSignage]

To add to the above, here are some things we tried:

• When we render the same portrait file in landscape mode, so that it fills the entire screen when we put the display in landscape mode, the screen tearing is not present.

• The issue is present with other mp4 videos, so the problem is not bound to a single mp4 file.

• Putting the "tearfree" option in our Xorg config (classic screentearing fix) does unfortunately not fix the issue.