On a freshly installed and updated Ubuntu 14.04 my ThinkPad E540 suspends successfully, but won't wake back up - a full reboot is necessary. Moreover, during the suspended state the fan is constantly working on considerably higher rpm than during normal usage, even though laptop's LED indicates sleep. However, it seems that both hardware and BIOS are OK, since suspend works fine on Windows 7.

I tried out solutions offered on similar problems, most notably this (use Nvidia proprietary drivers instead of noveau) and this, yet the problem persists.

pm-suspend.log reports everything was completed with success, except this:

Failed to connect to non-global ctrl_ifname: (null)  error: No such file or directory

This message is repeated thrice. The log ends with 'performing suspend'.

I really appreciate help with this matter.

EDIT: This procedure also didn't help.