Did a suspend resume test, with 15.10, kernel v4.3.
No external monitors connected.

Executed:
sudo sh -c "sync && echo 1 > /sys/power/pm_trace && pm-suspend"
several seconds after suspend (system is really suspended, blue suspend light 
is glowing), put it in resume with power button.
As before, other lights go on very shortly, system crashes (all lights off, 
sound of hdd shutting down not normally, same as long-pressing power button 
while system running), few seconds after that, system boots by itself, so not 
resumed.
Did same test with an extra udev rule so that resume with external mouse or 
keyboard works, same behaviour.

Added dmesg_crash.txt and cat /proc/acpi/wakeup output

** Attachment added: "dmesg_crash.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1255700/+attachment/4520974/+files/dmesg_crash.txt

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https://bugs.launchpad.net/bugs/1255700

Title:
  [HP EliteBook 8740w] suspend/resume failure

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