Doesn't boot into GUI after Trixie upgrade

[halbtaxabo-...@yahoo.com]

I upgraded from bookworm to trixie a couple of weeks ago (on an ordinary AMD64 
desktop running xfce and lightDM).After the upgrade it no longer boots into the 
GUI. I have to login and then run startx. Why? What's the recommended way make 
it boot into the GUI?
Another annoyance is that after booting and starting the X session, num lock is 
on. It never used to be. How can this be fixed?