NVIDIA - Ubuntu 20.04 - HDMI second monitor with blank screen, but xrandr detects it [Bug reported on Launchpad and freedesktop's gitlab]

multiple-monitors nvidia xrandr

  1. In the file /usr/share/X11/xorg.conf.d/10-nvidia.conf, add the line:

    Option "PrimaryGPU" "Yes"

  2. In the file /usr/share/X11/xorg.conf.d/10-amdgpu.conf, change the line

    from

    Driver "amdgpu"

    to

    Driver "modesetting"`

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