How do I solve screen tearing on Ubuntu 18.04 with NVIDIA?

Question

The answer on Nvidia drivers - Unable to check "Force full composition pipeline" does something that makes my laptop unable to detect the external monitor. Undoing the solution restores the ability to detect the second monitor. I'm still left with tearing on any type of video playback. Youtube, video player, etc.

I am using Ubuntu 18.04 with i7-8750H and RTX 2070 (nvidia-driver-430).

Edit:

Output of inxi:

Graphics:  Card-1: Intel Device 3e9b
           Card-2: NVIDIA Device 1f10
           Display Server: x11 (X.Org 1.20.4 )
           drivers: modesetting,nvidia (unloaded: fbdev,vesa,nouveau)
           Resolution: [email protected], [email protected]
           OpenGL: renderer: GeForce RTX 2070/PCIe/SSE2
           version: 4.6.0 NVIDIA 430.26

Screenshot of nvidia settings:

Answer 1

Update 08/09/2019:

It seems that gord0 (OP) is right in their comment. You don't need to go through all of the steps that I had previously described (I'm not deleting them, just in case that someone finds them helpful) to get rid of tearing.

What you have to do to is:

1. Open NVIDIA X Server Settings.

2. Go to X Server Display Configuration.

3. Select the screen that you want.

4. Click the Advanced button.

5. Enable Force Composition Pipeline or Force Full Composition Pipeline (try both and enable the one that gives you the best results).

6. Click the Apply button.

Alternatively, you can enable Force Composition Pipeline or Force Full Composition Pipeline by running the following commands in your terminal:

• For Force Composition Pipeline:

  nvidia-settings --assign CurrentMetaMode="$(xrandr | sed -nr '/(\S+) connected (primary )?([0-9]+x[0-9]+)(\+\S+).*/{ s//\1: \3 \4 { ForceCompositionPipeline = On }, /; H}; ${ g; s/\n//g; s/, $//; p }')"
  

• For Force Full Composition Pipeline:

  nvidia-settings --assign CurrentMetaMode="$(xrandr | sed -nr '/(\S+) connected (primary )?([0-9]+x[0-9]+)(\+\S+).*/{ s//\1: \3 \4 { ForceFullCompositionPipeline = On }, /; H}; ${ g; s/\n//g; s/, $//; p }')"
  

These commands use xrandr and sed with some regular expressions to get the current monitor setup in the appropriate format and use it as input to the nvidia=settings --assign command, which enables the desired setting.

You should now have no screen tearing.

In case the changes are not persistent and get discarded after reboot, you can do the following:

1. Run the appropriate, for your case, command from the commands above and make sure that it works correctly, that is you have no screen tearing in your monitors.

2. Add one of the following commands (depending on what worked best for you) to your Startup Applications.

   • For Force Composition Pipeline:

     bash -c "sleep 10 && nvidia-settings --assign CurrentMetaMode=\"$(xrandr | sed -nr '/(\S+) connected (primary )?([0-9]+x[0-9]+)(\+\S+).*/{ s//\1: \3 \4 { ForceCompositionPipeline = On }, /; H}; ${ g; s/\n//g; s/, $//; p }')\""
     

   • For Force Full Composition Pipeline:

     bash -c "sleep 10 && nvidia-settings --assign CurrentMetaMode=\"$(xrandr | sed -nr '/(\S+) connected (primary )?([0-9]+x[0-9]+)(\+\S+).*/{ s//\1: \3 \4 { ForceFullCompositionPipeline = On }, /; H}; ${ g; s/\n//g; s/, $//; p }')\""
     

   The sleep 10 command just adds a 10 seconds delay to ensure that the desktop has fully loaded before running the nvidia=settings --assign ... command. You may need to add a larger delay if your desktop takes more time to fully load.

Alternatively, you can save the configuration by clicking Save to X Configuration File button in NVIDIA X Server Settings.

---

Old answer. Try these if the above method doesn't work for you.

What is suggested in the answer you posted is correct for Ubuntu 16.04.

For Ubuntu 18.04 and later versions, you have to change options nvidia_387_drm modeset=1 to options nvidia-drm modeset=1 (the Nvidia driver version is no longer needed).

So what you have to do is:

1. Create a file in your /etc/modprobe.d directory called zz-nvidia-modeset.conf

   nano /etc/modprobe.d/zz-nvidia-modeset.conf 
   

2. Add the following lines to it:

   #enable prime-sync
   options nvidia-drm modeset=1
   

3. Save the file by pressing Ctrl+O and Ctrl+X.

4. From the terminal run:

   sudo update-initramfs -u
   

5. Reboot.

To enable the NVIDIA adapter, after rebooting you have to run:

sudo prime-select nvidia

Then log out and log back in.

Edit: If you are using GNOME, you may have to use another display manager, such as lightdm, since gdm does not allow external monitors to work with nomodeset=1 (I had to do this on 18.04 but not on 20.04).

• To install lightdm run:

  sudo apt install lightdm
  

• After installing lightdm run

  sudo dpkg-reconfigure lightdm
  

  and select it as your display manager in the terminal window that appears.