Created attachment 875571 [details]
/var/log/messages

I recently repurposed an old Lenovo B570 laptop by installing Leap
15.6 on it and there is a problem shutting it down: the system shuts
down but the computer does not power off, and continues to use
battery. I need to hold the power button down for a few seconds to
shut down properly.

It seems to do this regardless of how I shut down; I have tried shutting the
lid, using the XFCE menu, also
 # shutdown -h now
and
 # echo o > /proc/sysrq-trigger

I've googled and found similar problems in years gone by, also a more recent
Fedora one at
https://discussion.fedoraproject.org/t/unable-to-shut-down-system-after-latest-kernel-update/111543/18?page=2

None gives a solution other than "upgrade to the latest software".

Previously this computer ran a 32-bit version of Ubuntu, without encountering
this problem.

I've attached the end of /var/log/messages.