On Debian Sid with a Lenovo Thinkpad T14s AMD gen3 when I'm closing the lid it supposedly goes into suspend / #s2idle. But I have the feeling that for a month or so it's not working properly anymore. I'm losing ~20% battery charge over about an hour.

Guess I'll try a fwupdmgr update. It actually does mention some fixes for "Modern Standby" (ak. s2idle?).

Also speaking of power management / #sleep / #suspend on Debian / Linux: Even when the #standby / #s2idle power usage was still reasonable/working I typically ran into issues with running out of power and then fsck's on reboot.
I thought I saw config options regarding the levels in #systemd's sleep.conf, but maybe I misremembered. Took me a while to figure out that I could tune these in #UPower's configs instead.
And it's still confusing to me what the difference between Low/Critical/Action is.