[SOLVED] Laptop not rebooting/powering off

Hello!
It seems I have a problem with rebooting and powering off.
The symptom: stuck on "Rebooting" message.
I've read the systemd wiki page. The wiki advises to read this article. In the article, they suggest to check if it's a kernel problem first, by trying to reboot with the following command:
sync && reboot -f
This command also does not work. From the article:
If either one of the commands does not work, it is a kernel bug, not systemd.
I have no idea what can fix this and have not found any clue on the wiki.
Thanks.
UPDATE:
I managed to "solve" the issue by using the lts kernel instead the latest one.
pacman -S linux-lts
Now powering off, rebooting and sleep working fine.
Last edited by Demignom (2015-03-20 10:30:59)

Well, I wasn't able to solve the problem yet, but at least got some updated info. After disabling NMI (by setting kernel.nmi_watchdog = 0 in /etc/sysctl.d/disable_watchdog.conf), issuing sudo systemctl restart results in the following message:
A stop job is running for Daemon for power management
And nothing else on screen. I have waited about half an hour, but it never finishes. Just to make it more clear, there's a picture.
I would really appreciate any help, since I don't know in which direction else to check.
Regards.

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