Comment 52 for bug 1419355

Why exactly do you think there are non kernel related issues? My system works great except for the power off issue. Also note that these are not normal reboots,
it shuts completely off and only after about 3 seconds it turns itself back on.
I think the fast that /sys/firmware/acpi/pm_profile is not writeable is also supposed to be like that, I was merely pointing out that I don't know which /sys file is used to turn off PM. Also I can't really see the point with your suggestions for finding the issue. As I said it is clearly related to this issue though possibly more kernel commits are involved but bisecting is very hard because I'd have to test every bisect about 10 times because it tends to work quite a couple of times in a row. The thing is I really can't say if it ever worked because I don't have this laptop for long enough and there really is little reason to power off a laptop, I tend to reboot for updates and suspend when I don't use it so, at least this issue is only mildly annoying but I'd still like to see it fixed as it is I need to do "systemctl halt" and then press the power button if I want to shut down properly and safely.