I was able to make some progress in troubleshooting.
I went to the Screen Locking options and disabled "Lock after waking from sleep". Now I get to see the screen when I wake the computer back up, frozen as it was when I issued the sleep command.
All devices are disconnected - no network, no Bluetooth, no audio, all the “tray” icons are greyed out and/or showing errors, time is stopped at the moment I clicked the "Sleep" button.
Not sure if that helps at all.
What else do you need? CPU+GPU is there. MoBo? It's an MSI B650 Gaming Plus WIFI ATX AM5.
Would this part potentially get in the way of the method you suggested?
One fairly recent thread had a proposed solution of adding
"mem_sleep_default=deep"toGRUB_CMDLINE_LINUX_DEFAULTin/etc/default/grub.
Should I remove that?
I moved to Tuxedo from Kubuntu after having MASSIVE problems there, but I honestly can't remember if I was using the Sleep feature.
Is “sleep” hibernate or suspend?
How can I tell the difference? The button says "Sleep". I don't see anything like "Power Settings" in System Settings.
Also, is this triggered by manually putting to sleep or by for example closing a laptop lid?
It's a PC, not a laptop. I click the "Sleep" button in the Application Launcher.
Just tried it now. Does it need a reboot first? As in: should I try again?
I currently have no dedicated GPU, just a Ryzen CPU.
Tried that just now - doesn't work. It seems like all devices are disconnected so I can't use the keyboard to change the VT.