The excerpt from the changelog quoted above explains it:
powermanagement-interface (0.3.16) gutsy; urgency=low
* pmi.acpi: Disable suspend and hibernate if /host is mounted via fuse; disable hibernate if a swap file is active.
-- Colin Watson <email address hidden> Wed, 29 Aug 2007 18:40:49 +0100
Try
$ grep ' /host fuse' /proc/mounts
If there is an entry matching that, the changes shown above will cause suspend and hibernate to be disabled.
The excerpt from the changelog quoted above explains it:
powermanagement -interface (0.3.16) gutsy; urgency=low
* pmi.acpi: Disable suspend and hibernate if /host is mounted via fuse;
disable hibernate if a swap file is active.
-- Colin Watson <email address hidden> Wed, 29 Aug 2007 18:40:49 +0100
Try
$ grep ' /host fuse' /proc/mounts
If there is an entry matching that, the changes shown above will cause suspend and hibernate to be disabled.