Comment 3 for bug 1957808

Have a look at this webpage..

https://01.org/blogs/rzhang/2015/best-practice-debug-linux-suspend/hibernate-issues

In short:

1. edit your /etc/default/grub
a. make a COPY of the line GRUB_CMDLINE_LINUX_DEFAULT and modify like this:

GRUB_CMDLINE_LINUX_DEFAULT="initcall_debug no_console_suspend ignore_loglevel"
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

2. run 'sudo update-grub' to reflect the changes
3. reboot your pc
4. put your pc into STR, eg with 'echo mem | sudo tee /sys/power/state'

5. when your PC is suspended, wake it up and report back what you find.