I also tried to use a swap partition instead of a swap file. I removed
the swap file, added a swap partition and activated this for swapping
and resuming (in /etc/fstab: "/dev/sda4 swap ..." and in
/boot/grub/menu.lst: "... resume=/dev/sda4").
Now the hibernate button is available (see attachment) and hibernation
is working correctly.
So I think that there is a generell problem when using swap files and
hibernation. But I don't know if this is a kernel or Ubuntu problem. I
haven't another distribution to test it.
** Attachment added: "with hibernate button ("Ruhezustand" in german)"
http://launchpadlibrarian.net/17830199/with-hibernate.png
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cant hibernate to swapfile
https://bugs.launchpad.net/bugs/252143
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