So I had my usual problem with screen tearing on Ubuntu 19.10 but instead of my usual switching to Metacity + Compton I wanted to try using Gnome Shell. However Gnome shell doesn’t support replacing the compositor.
First step is to allow the NVidia driver to support kernel mode setting:
sudo nano /etc/modprobe.d/zz-nvidia-modeset.conf
options nvidia-drm modeset=1
sudo update-initramfs -u
sudo cat /sys/module/nvidia_drm/parameters/modeset
Then add a startup application
xrandr --output eDP-1-1 --set 'PRIME Synchronization' '1'
Finally switch from gdm3 to lightdm.
sudo apt install lightdm
This fixed the following issues:
- Vulkan need me to run
sudo vulkaninfobefore launching a game
- Suspend / Resume were not working
- External displays didn’t always work
- Nicer login screen!