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laptop still wants HDMI after reboot despite no device connected ! ( ubuntu 20.04 )

sz flag

After I booted with HDMI monitor plugged in, nvidia settings see only one monitor, not two (when plugged in after boot). In such configuration, sometimes it won't wake up after inactivity sleep. And now I see that my laptop won't accept to not have a HDMI screen, even if none plugged in at boot ! ( the laptop screen is still working since grub & the boot sequence appears there ).

( Ubuntu 20.04, Laptop DELL Inspiron M4800, nVidia, Mate. )

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