What is the exact command the powermanager inactivity timer sends to initiate a suspend?

If powermanager suspends the computer, a ton of errors are posted to the kernel log after wake (see https://gitlab.freedesktop.org/drm/nouveau/-/issues/12 and https://www.reddit.com/r/openSUSE/comments/j1au9t/drm_spamming_journald_log/)

If I issue systemctl suspend from the console or in krunner, the errors do not occur.

Second question: if necessary, is there a way to change the command powermanager uses?