I want to add that I think it is an issue with the Ethernet interface
and Wake-on-LAN. After a lot of back and forth with ChatGPT, I was able
to (at least temporarily) get the device to suspend on 6.8.0-52.
$ sudo ethtool enp0s31f6 | grep "Wake-on"
Supports Wake-on: pumbg
Wake-on: g
$ sudo ethtool -s enp0s31f6 wol d
Now suspend works, but not permanently. I did not want to make any
changes to the /etc/systemd/system files which is what it then suggested
to permanently disable Wake-on-LAN.
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https://bugs.launchpad.net/bugs/2096878
Title:
Computer waking immediately after suspend on any kernel newer than
6.8.0-38
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