You have to disable mei and mei_me kernel modules. It seems to be a problem related to the Intel Management Enging.

Add these lines to /etc/modprobe.d/blacklist.conf

blacklist mei

blacklist mei_me

then run sudo update-initramfs -u and reboot. This helped with most of the issues I had just like yours.

Again, I found the laptop cooking up in the bag, a couple of hours after I manualy suspended it and put in that bag. The pm-suspend.log file indicated that the laptop woke up 40s after it was suspended. The suspend function on the lid closing had been already disabled.

Now, I disabled the wake up function on the lid opening. I could not find a regular way to do it, but a sort of a hack:

echo "LID0 ">/proc/acpi/wakeup

I'll see if it helps.

Interesting. I dont think my issues were related to the lid at all. It would do the exact same behaviour of waking up from sleep even if the laptop was flat on a table and not moving. I'm fairly certain its all software related. I can tell you with 100% certainty that with the 7265 card, Kernel 4.1.1, and BIOS A04 my problems with it waking from sleep with the lid closed are gone, even with it banging around in my bag. Perhaps try upgrading to kernel 4.1.1?

I know of 2 sources of the wake up signal - the lid and the button. But you may be right that there could also be a bug in software. If the effect persists I'll have to look for other solutions. I hope that the sound/microphone issue with the 4... kernels will soon be resolved.  

I did it (blacklisting mei...) about 2 weeks ago. Since then I have seen saw 2 events of waking up with the lid closed. Such an effect is not uncommon, in particular with old laptops.  Perhaps, it depends on the quality/alignment of the lid sensor.