I can confirm that this bug also affects Linux Mint 18, which is based
on the 16.04 packages. I'm running it on a ThinkPad T420, which uses the
NVS4200M graphics chipset. It's set up as an Optimus graphics card, but
I have disabled Optimus in the BIOS and forced the use of the dedicated
GPU.

I'm using the same build of nouveau:

xserver-xorg-video-nouveau:
  Installed: 1:1.0.12-1build2
  Candidate: 1:1.0.12-1build2
  Version table:
 *** 1:1.0.12-1build2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

I can also confirm that switching to nvidia-361 allows the laptop to
suspend on lid close for me.

Using nouveau with Linux Mint 17.3 also caused this issue for me, though
I don't have the details of that install on-hand. I do still have the
drive on which it is installed if I need to get info on that.

I'm happy to provide any additional information.

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https://bugs.launchpad.net/bugs/1583303

Title:
  Laptop not going to suspend when lid closed

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