Works for me too on a Dell Studio 1749.

Steps:

1. Create new file /etc/modprobe.d/blacklist-suspend.conf with the
following two lines:

blacklist firewire_core
blacklist firewire_ohci

2. Run: sudo update-initramfs -u

3. Reboot and check that the modules were not loaded by running: lsmod |
grep firewire

4. Suspend the machine and bring it back up.

5. Hibernate the machine and bring it back up.

Both suspend and hibernate work now.

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

Title:
  suspend hibernation not working on dell 1749

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