I'm using Ubuntu 14.04 with Lenovo ThinkPad E440 and I'm having the issue that my labtop does not wake up after a suspend. I have to restart the machine. It's a bug of that model, reported here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1340376. I fixed the issue by disabling USB 3.0 in BIOS (note that disabling USB 3.0 in BIOS will make the USB ports work as 2.0). This is not the real solution but it worked.
Reference
http://askubuntu.com/questions/489912/thinkpad-does-not-wake-from-sleep-14-04
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