Noticing everyone in this bug report has Intel + Radeon graphics, I
tried disabling the Radeon.  Simply running 'sudo rmmod radeon' after
the laptop boots up with the stock 4.4 kernel allows it to properly
sleep.  Removing the kernel module causes kernel oops, but otherwise
everything seems fine after unloading it.  I've attached a dmesg showing
the kernel module removal with the oops, and the successful sleep/wake
that follows it.  I've tried it several times and sleep/wake is working
every time after removing radeon, and fails every time while radeon is
loaded.

** Attachment added: "dmesg after removing radeon module"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566828/+attachment/4640297/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1566828

Title:
  Suspension does not work, freezes the pc

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