I can confirm this bug and the same solution for my Intel 945GM.

I added i915.modeset=0 to the end of my GRUB_CMDLINE_LINUX_DEFAULT in
/etc/default/grub and ran update-grub and suspend and hibernate are
working perfectly again.

-- 
pm-suspend with quirks does not restore backlight anymore
https://bugs.launchpad.net/bugs/417599
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