Same here. As I mentioned here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566302/comments/48
and
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566302/comments/49
, kernels v 4.4 and 4.6 from http://kernel.ubuntu.com/~kernel-
ppa/mainline/ allow me to suspend.
The system won't respond to SysRq+REISUB. I tried running "systemctl
suspend" from the tty after killing lightdm, but that didn't help.

My system is a laptop, HP DV6-6174la, it has an AMD APU (A6-3400m,
integrated GPU: radeon hd 6520g) + dGPU (radeon hd 6750m).

BTW, if there is a pattern here, it seems to be the radeon module... Did
Ubuntu introduce custom changes to radeon? (OTOH, I've read reports from
ubuntu and other distros, that the kernel 4.4, and only this kernel,
caused many machines to be unable to suspend, but this bug seems to be
specific to ubuntu's kernel).

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https://bugs.launchpad.net/bugs/1589139

Title:
  [HP Pavilion dv6-6b52sl Entertainment Notebook PC] No suspend on
  Ubuntu 16.04

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