It looks like the problem is with the SATA controller. The relevant line from 
lspci:
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 
03)

I have found the exact same problem in Redhat bugzilla #476392:
"  Suspend and Hibernate don't work on HP DV5T  "
https://bugzilla.redhat.com/show_bug.cgi?id=476392

The HP DV5T has the exact same SATA controller, the symptom are the same
too.

What is the proper method to notify upstream? Looks like the bug is
identified.

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[Toshiba Satellite L300] suspend/resume problem
https://bugs.launchpad.net/bugs/324808
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