Ubuntu server 20.04 with gnome on pi 4 8gb not even showing dual displays in display settings. If your system does not recognize it immediately, or you would like to adjust the settings: Open the Activities overview and start typing Displays. To set up an additional monitor, connect the monitor to your computer. Reverting back to the standard 4.15 kernel made the problem disappear. But after upgrading my kernel to 4.19 my external monitor was not detected anymore. I did not have this problem on Ubuntu 18.04 with NVIDIA GeForce GTX 1050 Mobile and GeForce GTX 1050. If invoked without any option, it will dump the state of the outputs, showing the existing modes for each of them, with a '+' after the preferred mode and a '*' after the current mode. Xrandr is used to set the size, orientation and/or reflection of the outputs for a screen.
Just specify the information for both monitors in your command. The situation is similar for dual monitor set ups. $ xrandr -output DVI-D-0 -mode 1920x1080 -rate 60.00 How to Manage Dual Monitor Setups. Then, use the flag to set your monitor’s refresh rate. Select a rate that your monitor can use at its current resolution. The first screen was always extended virtually despite explicit xrandr instructions not to do this. Given a laptop screen (e.g., "LVDS-1-0") and a second screen (e.g., "DP-1") with the second screen being your primary screen and your monitor being to the right of your primary screen (or left) as an extension (see picture). Follow these simple steps to get started. This will allow you to use both monitors as one big screen instead of two identical ones (cloning). While methods such as the xinerama extension sometimes drive people insane, using RandR (Resize and Rotate) is quick and painless.
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