FWD: Automatic screen locking

[local10 <local10@tutanota.com>]

> Hi,
>
> For some reason automatic screen locking stopped working for me. It used to work some time back but then just stopped. I currently have the "Lock screen automatically after" set to one minute (for test purposes) but it just doesn't lock the screen even after 5 minutes. I can still lock the screen manually though.
>
> Any ideas? Thanks
>
More info:

# echo "It's a Debian Buster PC"; uname -a
It's a Debian Buster PC
Linux tst 4.19.0-10-amd64 #1 SMP Debian 4.19.132-1 (2020-07-24) x86_64 GNU/Linux

# aptitude show kde-standard
Package: kde-standard                  
Version: 5:102
State: installed