Video issue, screen is tearing

[Massaker]

When I watch videos I am getting screen tearing.
* This happens from multiple apps. (firefox: youtube, mpv: video player, vlc: video player)
* This is an example of what I mean by tearing https://levvvel.com/wp-content/uploads/ ... fix-it.jpg

I have 2 screens
* Optoma projector
* LG ultra-wide monitor

The tearing will only happen on the projector. If I watch the exact same video on the LG monitor it works perfectly.
* Also If I boot in windows I get zero screen tearing.

Any ideas?

[NeddySeagoon]

Massaker,

That's a video artefact that has two possible causes

1. Only using one pixel buffer, so the pixel buffer that is being used to refresh the screen is being updated with the next image at the same time.
That does not normally result in such a clean horizontal 'tear'.

2. Using several pixel buffers, so that one is being used to refresh the screen and another is being drawn in with the next image.
So far, so good.
What is supposed to happen is that the pixel buffers are switched during the vertical blanking, when nothing is being sent to the display. Then you don't see the switch.
When the switch is not synchronised like that, you see a piece of the old frame at the top (before the switch) and a piece of the new frame (after the switch) at the bottom.
So we can tell that the character in your image is moving from left to right across the screen.

We need to know what video card you have and which video driver you are using.
Most video drivers do the double buffering and sync without being told but they all have knobs to turn it on/off.

Please post the output of

Code: Select all

lspci -nnk

and the content of your Xorg.0.log file.

[Massaker]

Screen tearing has stopped after enabling ForceCompositionPipeline and Force Full ForceCompositionPipeline

I did this by adding the following to /etc/X11/xorg.conf

Code: Select all

Option         "metamodes" "1920x1080_60 +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}" 

full context

Code: Select all

# Removed Option "metamodes" "HDMI-0: 1920x1080_60 +0+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "1920x1080_60 +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

you can also find these settings by

• nvidia-settings
  • run this command
  X Server Display Configuration
  • click this menu item on the left-hand side
  Advanced...
  • click this button on the bottom-right
  ForceCompositionPipeline & Force Full ForceCompositionPipeline
  • these two checkboxes will now show