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[Unit]
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Description=Detect second DISPLAY using xrandr
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[Service]
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Type=oneshot
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ExecStart=/bin/bash -c 'export DISPLAY=$DISPLAY.1; xrandr -q | grep "connected" && echo "DISPLAY=$DISPLAY" > ~/.second_display || rm -f ~/.second_display'
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[Install]
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WantedBy=yavdr-desktop.target
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