On a fresh install of 18.04, with laptop and two external monitors, I turned off the laptop display in Settings->Devices->Screen Display using the ON/OFF slider. How do I turn it back on again? Once turned off, it is taken out of the display arrangement. If I remove the laptop from the dock and power-on, it's display works. If I hot plug into the dock again, the two external monitors switch on, but the laptop screen switches off.
Ubuntu – 18.04 Turned off display in Settings-Devices-Screen Display ON/OFF, how to turn on again
18.04displaysystem-settings
Related Solutions
Try installing arandr ,in your system as it gives you gui , which is easy to mange
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In the outputs tab you can easily turnoff your laptop's display (LVDS) and keep your monitor's one (VGA or in your scenario it might be HDMI1) as your primary display and save the layout. Add the following layout script into your startup menu, so when next time you login to your desktop it works without any extra inconvenience.
Switch to tty1 with strg + alt + f1, login and remove your /etc/X11/xorg.conf.
Then run sudo systemctl restart display-manager.service.
This will reset your settings and you can start configuring again.
You can also run nvidia-xconfig before restarting the display-manager which would create a default config for nvidia.
Best Answer
You can turn it back on by clicking on your monitor number in the Display menu and selecting the monitor that is turned back off. Screengrab below: display monitor selection
Each monitor has a number. If you go to
Settings > Devices > Screen Displayand find the monitor number that is your primary monitor. Click on the number and it will show you a dropdown menu of all available monitors. Select the one you turned off and turn it back on.