I've been trying to re-enable power management for the modem on the #librem5 running #postmarketOS, but was plagued by issues with the modem resetting immediately every time is suspended/resumed.
Once again, the product of hours of git bisecting and testing is a patch that's less than 1 word
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/932/diffs