Comment 98 for bug 1566302

Hi again,

Still same problem, wakeup from hibernation freezes at some time, with latest kernel (4.4.0-31),
that is to say the system becomes totally unresponsive, the screen may go black or not.

It seems that the system is not always able to write something in logs when this occurs :
in /var/log/kern.log there is sometimes nothing, sometimes a general protection fault, sometimes one line with only @@@@@@@@@@@@@ symbols (??).

In the meantime, suspend to ram is absolutely stable.

Nevertheless, I noticed that if I switch ON the nvidia card (*) just before hibernating, freezes seem to occur less often.

Again, if anyone has some hints about how to debug.

Regards

(*) The T440s has got two graphic cards, integrated intel and nvidia G730M, the nvidia card is switched OFF by default at boot with bbswitch module, I can switch it ON with "echo ON > /proc/acpi/bbswitch"