Comment # 2 on bug 955471 from Wolfgang Bauer

(In reply to Armin Mohring from comment #0)
> I have select a different background for the login screen.
> But the background for the lock screen should be changeable.

It is changeable in systemsettings5->Workspace Behavior->Screen Locker. And
changing it works fine here.

> Background is "interesting"

Could you please explain in more detail what "interesting" means here?

(In reply to Armin Mohring from comment #1)
> Should also be possible for the theme of lock screen.
> Similar to the login screen.

The theme is changeable as well, in the same settings module.

And please, stop playing with the priorities. This field is for the
developers/maintainers to prioritize the bugs they are working on.

The "Severity" field is for you to specify how grave the bug is.