Steps to reproduce: 1. watch the log with `journalctl -x -f` 2. run `xdg-screensaver suspend 0xsomevalididhere` powerdevil will do the following: Aug 09 00:10:51 archbook org_kde_powerdevil[797]: powerdevil: Scheduling inhibition from ":1.12" "0x5c00001" with cookie 24 and reason "xdg-screensaver" Aug 09 00:10:51 archbook org_kde_powerdevil[797]: powerdevil: Releasing inhibition with cookie 24 Aug 09 00:10:51 archbook org_kde_powerdevil[797]: powerdevil: It was only scheduled for inhibition but not enforced yet, just discarding it mpv's current git HEAD relies on xdg-screensaver to suspend the lock screen, so this is somewhat irritating.
*** This bug has been marked as a duplicate of bug 381160 ***
This is not a duplicate of that bug, for me, the inhibition does not work at all. The screen lock or dimming proceeds regardless.
Nevermind, just read all the comments on that bug report and it looks like this was reported upstream and indeed the same issue.