Ubuntu 14.04 can not enter to waiting mode with driver newer than 352. GTX 750 Ti

Issue: waiting mode doesn’t work. Computer hangs.
Details: when system goes into waiting mode, display becomes black, I hear HDD to have stopped, but coolers continue working. The system just hangs.
Steps to reproduce:

  1. Switch to waiting mode via standart GUI.
  2. Reset button because it’s impossible to start computer in a standart way.

As it’s mentioned above the issue is actial for drivers newer than 352. It is affected with ubuntu 14.04.03 and 14.04.04 with updated kernel 4.3 and new X server.
apport.log (1.29 KB)
nvidia-bug-report.log.gz (131 KB)
pm-powersave.log (128 KB)