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I have a bunch of Centos workstations with different Nvidia cards. In the nvidia-settings interface, I need to enable this option: Force Full Composition Pipeline.

This is then saved to /etc/X11/xorg.conf. It appears like this in the file:

    Option         "metamodes" "DVI-D-0: nvidia-auto-select +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}, DP-0.8: nvidia-auto-select +1920+0"

The issue I have is that at each boot, my xorg.conf file is reset containing only:

Section "Device"
    Identifier  "Videocard0"
    Driver      "nvidia"
EndSection

Is it normal that this file is reset at each boot? How can I disable this function and be sure that the option is enabled at each boot?

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You can run this script at startup:

nvidia-settings --assign CurrentMetaMode="$(nvidia-settings -q CurrentMetaMode -t|tr '\n' ' '|sed -e 's/.*:: \(.*\)/\1\n/g' -e 's/}/, ForceCompositionPipeline = On, ForceFullCompositionPipeline=On}/g')" > /dev/null

If you want it to be executed on startup, you can drop those lines in an executable file in /etc/X11/xinit/xinitrc.d/

Eg: /etc/X11/xinit/xinitrc.d/99-force-composition-pipeline

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