[Desktop] Setting Primary Monitor in Dual Monitor System Fails to Remain Selected Upon Reboot Using X11 & 25.04 vs 25.10 Question

[TheSupremeVizier]

I have a two monitor set up, side by side. I prefer the left monitor set as primary. I go to System Settings > Display & Monitor and select the left monitor as primary and I apply those changes. The system then recognizes the left monitor as primary. I eventually reboot. When the system comes back up, the right monitor is primary, and again I must go to System Settings > Display & Monitor and select the left monitor as primary and hit Apply. I know I can get around this by running an xrandr script during a login autostart, but I really shouldn't have to do this. If you know of a fix for this other than my xrandr work-around, please let me know.

I know xrandr doesn't work on Wayland, and I rarely use Wayland because of other significant problems I have previously reported here. I know very little about how to manipulate Wayland. I suppose I could upgrade from 25.04 to 25.10, but I don't know if that fixes all the issues I currently see with Wayland. I am currently running the Nvidia proprietary 580.65.06 driver ("Using NVIDIA driver (open kernel) metapackage from nvidia-driver-580-open (proprietary, tested)") for a GeForce RTX 5070 GPU. Does 25.10 provide an upward revision to this Nvidia proprietary driver? If I should be able to answer that last question on my own, please teach me how to do so.

Thank you very much in advance.

[jrwatts]

This doesn't answer your primary question, but you can use kscreen-doctor instead of xrandr on Kubuntu Wayland. The options and syntax are different, so read the --help first.