i had this problem as well on a Sony Vaio VGN-BX560B. This box has an intel hda sound card. I was able to get the laptop to turn off by forcing he removed of the sound module.
I did this by adding the line rmmod snd-hda-intel to /etc/default/halt Hope this helps someone. -- Power down after shutdown does not work... https://bugs.launchpad.net/bugs/43961 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
