On Tue, Feb 08, 2022 at 09:43:27PM -0500, Alex wrote:
Hi,
I have fedora35 installed on my desktop with a Radeon RX 570 driving
three monitors, with the Cinnamon desktop, although it could be the
other variation of Cinnamon that's available by default - I checked
the Settings menu and can't find any way to determine which it is.

You're on X11?

To find your environment:
  env | egrep -i "xdg_curr|session_type"

"session_type" is important: wayland or X11?

If that does not help, I'd try
  loginctl

then
  loginctl show-session <number received via "loginctl"> -p Type

[ ... ]

Now, when I set the "turn off the screen when inactive for" option to
5m in the Power Management settings, I find that it takes far longer
than five minutes for it to actually turn off the monitors, but then
not only do they all immediately turn back on, but all of the windows
on the middle monitor are shifted to the two left and right monitors.
wtf? It's incredibly frustrating to have to reposition all windows
back to their original location.

There might be other settings that clash with "Power Management
settings" (no idea what you mean by that: probably some GUI where you
set that?)

On X11 I'd try
xset q

and then have a look at the
"Standby", "Suspend", and "Off"(?) settings.

Also: As Stan already wrote, I'd look at journalctrl output when
things go wrong. I'd try:
sudo journalctl -f -n 5000

If you're on wayland I cannot help. Sorry about that.


How do I troubleshoot this?

I running X11. And so far I tried to more or less rigorously avoid X
settings via some GUI. I run xrandr to attach external monitors to my
computer - so if you're on X11, be welcome to come back before I go
into details about that.

Wolfgang
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