I’ve never used Proxmox, so I can’t say. But TLP is a utility that starts at boot. I’ve used it with virtualbox running, so if Proxmox runs atop a host operating system, I don’t imagine that it would interfere with TLP.

As an additional note, I usually set the min/max thresholds at 40/80, so the battery will charge any time it’s plugged in and below 40% and stops charging when it reaches 80%.

Nice to know that the latitudes work with TLP, since it opens up another set of possibilities for the future!

I use a 2011 ThinkPad X120e as an FTP/Syncthing server. It was underpowered as a laptop from day one, but still works fine as a lightweight server. The best thing about ThinkPads is that TLP allows you to set min/max charging thresholds, so that you can keep an old battery in good shape for … well, I’ll let you know. This one’s 14 years old and still has a four-hour run time.

One thing I’d like to try is “Wake My Potato” for shutdown / automatic restart when a power outage occurs.

Links:

TLP - https://linrunner.de/tlp/index.html

Wake My Potato - https://github.com/pablogila/WakeMyPotato

Late response. I used to host radicale, but switched to MyPhoneExplorer a few years ago. I just sync from the laptop to the phone over bluetooth. It does contacts and memos as well. Reminds me of the old Palm Desktop sync.