System :
- Ubuntu 18.04,
- Linux 4.15.0-39-generic
- nvidia 390.77 driver, installed from the sources/drivers manager
- Gnome 3.28.2, Wayland session, gdm3
- Nvidia Prime laptop, HDMI output wired on the discrete GPU
Issues :
when launching nvidia-settings, I get this error :
$ nvidia-settings
ERROR: Unable to find display on any available system
Synaptic doesn't launch (error message translated from French):
$ sudo synaptic
Invalid MIT-MAGIC-COOKIE-1 keyUnable to init server: Unable to connect : Connection refused
(synaptic:5188): Gtk-WARNING **: 14:19:42.755: cannot open display: :0
If I try gksu instead of sudo (which is bad, I know), the GTK password window doesn't capture the text input, so the password gets written in clear in the terminal used to launch it.
glxgears works, but at a ridiculous 60 FPS. The HDMI external monitor doesn't work.
Why I want/need Wayland :
I mostly use the GPU for OpenCL computations (and external display wiring). Using Xorg (which works), the vRAM gets up to 1066 MiB sucked by Gnome Shell + Xorg. Using Wayland, it's only 75 MiB. Gnome + Xorg seem to have serious memory leaks, their RAM footprint increases as the OS is running.
Already tested :
The usual:
$ sudo apt autoremove --purge nvidia*
$ sudo apt update
$ sudo reboot
Then reinstall Nvidia + reboot.
