Sonoma Login Screen is Grayed-Out

It may be possible during the upgrade process from Ventura, that something did not get completed properly.

One thing you can try is to create a new user account to see if the default Sonoma wallpapers appear. If they do not, then the required wallpapers are missing or not located in the proper directory folder.

betacygnus wrote:

My understanding is that the login screen is supposed to show the default image of Sonoma Valley. I use a dark blue custom color for my desktop wallpaper. There is also a "lockscreen.png" file which is solid dark blue, inside a folder, which itself is inside the /Library/Caches/Desktop Pictures folder.

Please advise if this is "normal" or not.

The default macOS Sonoma login screen does have the Sonoma Valley image. Once you log in, you should be presented with the Desktop wallpaper that you chose.

Indeed the folder location you mention in your post should contain a single folder, and inside that folder would be the default lockscreen.png. In my case, the default .png looks like the following:

Excellent! I'm glad you got it worked out.