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xrandr
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xrandr --auto
Then I suspected it miss drivers, and I installed Nvidia drivers, https://wiki.debian.org/NvidiaGraphicsD ... Stretch.22, Unfortunately, I cannot log onto graphical interface at all.
Finally, I tried to rescue it, and
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apt-get purge nvidia.
Then I have to reinstall but with Ubuntu 18.04.1, and it can easily detect my displayport monitor.
Does anyone know how to setup on Debian 9.5 anyway?