I have a STudio 1749 and experienced the same problem when moving to
2.6.38 from 2.6.35.  My hardware profile is very close to the original
poster's.  I too was frustrated with the problem.

However, after enabling the pm_trace functionality, I was able to
identify the offending modules: firewire_core and firewire_ohci.  After
rmmod'ing these two I was able to successfully resume from suspend.  I
added them to the blacklist and have not had a problem.

One issue I did run into, however, was after resuming the clock was be
10-20 years fast. STill working on a fix for that, but resume is now
functional.

Hope this helps.

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https://bugs.launchpad.net/bugs/748994

Title:
  suspend hibernation not working on dell 1749

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