A SOLUTION that worked for me.

Dell E6410, Core i7, Nvidia NVS 3100M that would not resume from suspend
or hibernate. Backlight comes on, but screen remains black when it comes
out of suspend.

Tried a bunch of things, read a bunch of thread.  This worked in one
quick change.

- Edit /etc/default/grub from the command line via sudo
- Set the GRUB_CMDLINE_LINUX_DEFAULT variable as follows:

GRUB_CMDLINE_LINUX_DEFAULT="nouveau.modeset=0 acpi_sleep=nonvs"

- Run “sudo update-grub” at the command-line
- Restart Ubuntu

Solution credit is due to
http://vxlabs.com/2010/11/30/ubuntu-10-10-x86_64-on-your-dell-e6410
-with-nvs-3100m-gpu/

Also, I found that deactivating the Nvidia driver through System >>
Administration >> Additional Drivers would also prevent the suspend
problem.  The instant I re-enabled the Nvidia driver it would not
resume.  The fix mentioned immediately above works with the Nvidia
driver enabled too.

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https://bugs.launchpad.net/bugs/578673

Title:
  [arrandale] Resume doesn't work on a Latitude E6410

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