Ubuntu – How to disable wayland in 17.10 in gdm3 login screen

17.10display-resolutionradeonwaylandxorg

I just installed ubuntu 17.10.
I'm using a Ryzen 1200 CPU and an RX-560 GPU with a 2580×1080 60Hz monitor.

The monitor is connected to the GPU through an HDMI cable.

When I'm using the native monitor resolution of 2580×1080, in the wayland session, the screen makes these very weird glitches. The glitches look like a refresh rate issue, one that is fixed by v-sync, but they are very intense and on the whole screen. As soon as I change the resolution to a lower one the screen becomes normal.

In the x.org session I can use whatever resolution I want, everything works great.

The problem is that during the boot-loading screen (the one that says "ubuntu") and at the login screen I see the same glitches on the screen until I login.

Is the boot-loading-indicator using wayland? Can I make it use x.org/x11? The same for the login screen?

Best Answer

You need to edit /etc/gdm3/custom.conf, change this line:

[daemon]
# Uncoment the line below to force the login screen to use Xorg
#WaylandEnable=false

to 

[daemon]
# Uncoment the line below to force the login screen to use Xorg
WaylandEnable=false
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