Unable to save display settings anymore (nvidia driver)

After a recent update, my system no longer remembers the settings for monitor display resolution and rotation.
I am using Manjaro Cinnamon edition with the non-free Nvidia driver, and it was working fine for 3 years.

Each time I boot, I am able to manually set the display resolution and rotation using nvidia-settings.
However, nothing is remembered on the next boot even if I “save X configuration” to /etc/X11/mhwd.d/nvidia.conf
I tried using ARandr to generate a shell script and saved it to /etc/X11/xinit/xinitrc.d/90-something.sh
Still no effect. On the next boot the monitor resolution goes back to default, and my second screen is rotated wrong again.
Is there some new way to save the display configuration?
On a side note, I can no longer find any Display settings in the Start menu or in System Settings.