Found this post buried, but I'm having a similar issue. The cause seems to be laptop-mode... if laptop-mode is enabled, suspend immediately revives, but it works fine when laptop-mode is disabled.
I don't think you really want to be suspending in laptop mode anyway, because I'm pretty sure that there is no syncing going on, so any info that hadn't been written to disk thanks to laptop-mode would be lost? I'm still looking into this... seems someone should have gotten workable laptops/battery controls by now...
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