Comment 25 for bug 1170911

I have uninstalled nvidia driver, but the problem is same with some small changes:
- suspend and hibernate does not hang, but ends up only in login screen
- shutdown hangs again with mount: / is busy, but not always. Some attempts were successful.

Now I see also this message when trying to suspend the computer and than shutdown:
udevd timeout: killing /sbin/modprobe -bv pci
This is reported here: https://bugs.launchpad.net/ubuntu/+source/udev/+bug/1092102

Maybe this bug depends on some ACPI event?