In these situations I usually try a manual sleep and monitor the script
as it runs.

Firstly I edit /etc/acpi/sleep.sh and add "set -x" at the start of the
file. Then I switch to a virtual terminal and run:

$ sudo /etc/acpi/sleep-sh force

And monitor the output. If there are problems with the screen blanking
and not restoring, I use:

$ sudo /etc/acpi/sleep-sh force >/tmp/sleep.log

or, if the PC locks up and has to be reset:

$ sudo /etc/acpi/sleep-sh force >/var/log/sleep.log

If you could try this maybe we can determine if the issue is in gnome's
power-management handling or is a wider problem.

-- 
suspend works on tribe 5, fails with updates since then, vaio TZ190N
https://bugs.launchpad.net/bugs/136688
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