After some research I found errors related to i915 module (see some
output attached).

I tried some kernel module parameters without success, but the solution that 
seems to work for me is disabling of SNA acceleration-backend following:
https://wiki.archlinux.org/index.php/Intel_graphics#SNA_issues

Would be great, if someone could confirm.


** Attachment added: "sleep_err_output.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301601/+attachment/4397940/+files/sleep_err_output.txt

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Title:
  [Dell Latitude E7440] suspend sometimes freezes when lock screen
  activates

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