Bug#779412: /sys/power/pm_async defaulting to 1 : unreliable resume event execution

[Chris]

There is now a specific spin-off from the closed
https://bugs.debian.org/780956 (laptop-mode-tools hooks not triggerd)
in the udev binary package: (reassing to src:systemd did not succeed)


To ensure packages have a reliable resume event hook available, udev may
echo 0 > /sys/power/pm_async, or some device blacklist may be needed (in
the kernel?) to disable async pm?.
https://bugs.debian.org/783638
(original reporters may subscribe)

The relevant "trigger on resume" mechanism from udev seems to be:
ACTION=="add|remove", SUBSYSTEM=="machinecheck", RUN+="lmt-udev auto
force"