I have a laptop running F40 Server with KDE, fully updated, that I
have been using without issue.  I am in the process of moving to a new
laptop and plan to repurpose the old one.  But I am running into an
issue with the old laptop.

If the laptop is idle it locks up after ~25 minutes.  "Idle" can mean
no one logged-in, or a user logged-in but not doing anything.  If the
user is doing something, it does not lock-up.  "Something" can be
running a Windows 10 VM, a ssh session running "top", etc.  To recover
the system I have to do a hard-reset using the power switch.

Things I have checked:
- Nothing is displayed on the screen
- There are no entries in the UEFI BIOS logs
- There are no messages for the lock-up shown by "journalctl -b -1 -r".
- All of the entries in /etc/systemd/sleep.conf have been changed from
"yes" to "no" and uncommented - no change
- systemctl entries for sleep, suspend, hibernate have been masked - no change
- Even though the desktop is KDE, I have checked "gsettings" for any
power or timeout related settings - nothing of interest
- If I boot off of a F40 Cinnamon install on a USB SSD drive, there
are no issues.

Theories:
- auto sleep/suspend/hibernate - contraindicated by no change in
behavior with changes to sleep[.conf and/or masking system units.
Also, system should wake-up from any of these states.
- thermal event - contraindicated by lack of UEFI log entries, lack of
issue when system is active, lack of issue when booted off of USB
drive
- hardware issue - contraindicated by lack of issue when system is
active or booted off of USB drive.

Any suggestions?  The only other thing I can think of to try is a
re-install; I plan to do this eventually anyway, but wanted to delay
for a few weeks.  In the meantime I guess I can keep the Windows 10 VM
running, it just seems wasteful.
-- 
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