My current laptop is a Dell XPS 15 with a 3200x1800 screen. While I'm at work I use two external 1920x1800 screens.
I've tried many Linux distributions, but none of them has a good support for multiple displays with different pixel densities. So I have no choice Windows here I come.
I've downloaded the latest ISO and created a Live USB and... Reboot
Strangely there was no scaling at all, the density of the main screen was copied to all the others.
Even worst I was not able to configure correctly my external monitors (on the left and one in portrait mode).
I fast search and with the command
I've found out I was still using X11.
In my opinion not the best choice to force me to install the full operating system to test one feature; especially now I can't afford to format and reconfigure the entire machine.
Here is how I've tried Wayland on Ubuntu 17.10 Live USB without the need of installing.
You need to log out from the current session and go back to the login screen.
Once here press
CTRL + ALT + F6 to open a terminal that is not emulated in the windows manager.
Here log in with the user ubuntu, which is a default user with administrator privileges.
GDM3 is the GNOME Display Manager and is the responsible to orchestrate the display server and the desktop environment.
To stop it run
sudo /etc/init.d/gdm3 stop
Configure GDM3 to use Wayland by editing the configuration file
Change the line
# Uncoment the line below to force the login screen to use Xorg WaylandEnable=false
# Uncoment the line below to force the login screen to use Xorg WaylandEnable=true
Also disable the automatic login feature.
Changing the line
To start GDM3 again it run
sudo /etc/init.d/gdm3 start
To go back to the graphical environment and try Wayland press
CTRL + ALT + F1
At this point simply log in and have fun.