RE: Odd hang on suspend and shutdown

quoted

I suppose you were not seeing this issue on e.g. a 4.1 kernel (assuming
this is not a brand new laptop) ?

Nope, 4.1 is fine. This is my travel laptop for the last almost two
years. Best laptop I've ever had (I like them small and light).

If this two years old that's probably not HSW, can you send out the exact HW info, mostly pci device ids are in interest. 

quoted

If that's the case, is any of the pn544* kernel modules loaded when
running on top of a good kernel ?

So it doesn't show up in lsmod, but presumably the module got loaded
and then errored out or something. The mei and mei_me modules are
loaded, nut no pn544_mei.

This should be loaded only if you have NFC on the board or it bailed out more cleanly before.
There is a file under debugfs mei0/meclients , if you can send out the dump we can see what we support on that platform.

I'm not even sure why it's in my configuration, because I tend to try
to keep those small, and my config was generated (long ago) with "make
localmodconfig", but maybe there's something non-obvious that brought
it in. Presumably that pn544 module was loaded at _some_ point in the
past.

Frankly, if you are not using any of the pro or NFC you don't really need that loaded.

I just tested, and loading it manually with "modprobe pn544_mei"
doesn't seem to do anything bad.  I can still suspend with a good
kernel. So it's not just about loading the module, there's some other
interaction going on.

The question if the module get bound to the NFC me client?

Thanks
Tomas