Closing as problem has been fixed ... Thanks for reporting this!
** Changed in: Ubuntu
Status: Unconfirmed = Fix Released
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connected USB mouse prevents resume from suspend-to-RAM
https://launchpad.net/bugs/49559
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ubuntu-bugs@lists.ubuntu.com
The problem disappeared this week - I don't know exactly after which
changes, I only found out by accident, when I forgot to unplug my mouse
and the machine nevertheless resumed just fine!
There was an update to acpi-support which I didn't pay too much
attention to at the time, but supposedly
