Hi all I also have been facing this same problem. Suspend and hibernate switches off the screen and it's not possible to enable it again. I also use GForce nVidia and it may be the cause for this but not sure about this. This is my uname results.
Linux buddhika-laptop 2.6.22-14-generic #1 SMP Tue Feb 12 02:46:46 UTC 2008 x86_64 GNU/Linux -- http://luckycala.wordpress.com
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