STR problems are often caused by a hardware driver either blocking
status change to STR, or a hardware driver failing to re-initialise on
return from STR.

Depending on your BIOS, I found a useful method to debug this is to
disable as much on-board hardware (usually through the BIOS screen) as
you can. Then try to go into/ recover from STR.

You can also try rmmod <modulename> for various hardware drivers. This
will remove the driver from the current running kernel. The driver
should then load properly after next reboot.

Once you have identified the hardware/ driver preventing STR, it will be
much easier to fix the bug.

-- 
Suspend to RAM (Sleeping) not working on DELL Latitude D520
https://bugs.launchpad.net/bugs/119423
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