I spent a good long time tracking this down last night (gnome-power-
manager uses hal to check. lshal says that hibernate is disabled. lshal
was getting its information from /usr/bin/pmi which is part of the
powermanagement-interface package).
I have a single swap partition and the problem appears to be this line within
pmi:
hibernate)
if grep -q ' /host fuse' /proc/mounts || \
swapon -s | tail -n +2 | awk '$2 == "file" { exit 1
}'; then
result=1
Alas the file is not commented so it's not clear exactly what the intent
of those lines is. But I'm assuming that it is trying to disable
hibernate if you are using fuse or (that's the ||) if you are using swap
to a file. The problem is that I think the logic is inverted.
The
swapon -s | tail -n +2 | awk '$2 == "file" { exit 1 }'
is the key to the issue. I think this takes the output of swapon -s, skips the
first line and then searches the rest for the parameter "file" in field 2 (the
type) and returns 1 if it found and 0 otherwise. By contrast, if the grep
command finds what you are looking for then it returns 0, if it cannot find
what you are looking for then it returns 1.
Shells generally interpret truth as 0 and anything but 0 as false. The
above swapon snippet returns false if it thinks you have a swap file
causing it to take the first branch on systems that DON'T have swap
files. Thus I think it will return that hibernate is not possible on
systems without swap files.
(So a quick fix is to remove the swapon check. Alternatively you can fix
up the logic using variables to store intermediary values to make things
more obvious)
--
Hibernate missing from shutdown menu after 30/08/07 updates
https://bugs.launchpad.net/bugs/136433
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