I could see these lines in /var/log/syslog when this happens:
swsusp: Not enough free memory
Error -12 suspending
Maybe this is not really a bug?
** Attachment added: "Snippet from /var/log/syslog"
http://launchpadlibrarian.net/10778154/syslog-snippet.txt
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computer doesn't hibernate
https://bugs.launchpad.net/bugs/165328
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