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there can be various file index services that run to allow faster searching of the system.
these typically run in a schedule, but in a new install they may run on the first boot.
after they run the first time, they will run occasionally on a schedule.
I am not sure if time shift does this or not, I never use that tool.
For mouse battery it may depend on the specific mouse and it's drivers.
there are some enhanced mouse/keyboard utilities out such as that 'libratbag'.
I'm using a 3440x1440 monitor and have no resolution problems on Pop!_OS. I'm not a Linux power user or anything so I probably can't help diagnose the problem but just letting you know that that's not a universal experience
https://www.reddit.com/r/pop_os/comments/loeo3j/how_do_i_change_login_screen_resolution/
You have to set login screen seperately, or at least did when I changed monitor last. Cant remember what I did, but try this. To be safe I suggest checking you're not overwriting anything on the cp destination, make a backup of the file if there is one
edit: sorry just noticed your a new linux user. To check your not overwriting use ls /var/lib/gdm3/.config/monitors.xml - if it exists it will show it on the return statement. Then cd to directory and use mv to rename file.