Screen blinking after last update

And here:

Taken from Known Issues and Solutions in the Stable Update 2025-12-15 announcement thread:

Optional switch to older Nvidia driver

For a list of possible drivers for your hardware run

mhwd -l

If your system was automagically rolled to a supported kernel you may run into conflicts with the meta package(s).

Remove the meta packages

sudo pacman -R linux-nvidia-meta linux-meta

If you are using a desktop system and you are in doubt if you are affected

  • Before you reboot - remove the current driver
    sudo mhwd -r video-nvidia
    
  • Use an earlier driver mhwd -i video-nvidia-{575xx or 570xx}
    Example command
    sudo mhwd -i video-nvidia-575xx
    

Of potential interest might be recent Nvidia Known Issues:


For those with (particularly older) Nvidia graphics, please verify that your GPU is actually supported.

Many models are being progressively dumped by Nvidia, with each new iteration of their proprietary drivers:


Anecdotal:

While it may of course vary according to hardware used, my personal suggestion is to consider using AMD graphics, going forward; AMD graphics are (generally) already better suited to Wayland.